[v3] graph: avoid id collisions

Message ID 20240618092324.54166-2-rjarry@redhat.com (mailing list archive)
State Accepted
Delegated to: David Marchand
Headers
Series [v3] graph: avoid id collisions |

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Commit Message

Robin Jarry June 18, 2024, 9:23 a.m. UTC
  The graph id is determined based on a global variable that is
incremented every time a graph is created, and decremented every time
a graph is destroyed. This only works if graphs are destroyed in the
reverse order in which they have been created.

The following code produces duplicate graph IDs which can lead to
use-after-free bugs and other undefined behaviours:

  a = rte_graph_create(...); // id=0 graph_id=1
  b = rte_graph_create(...); // id=1 graph_id=2
  rte_graph_destroy(a);      // graph_id=1
  c = rte_graph_create(...); // id=1 graph_id=2 (duplicate with b)
  rte_graph_destroy(c);      // frees memory still used by b

Remove the global counter. Make sure that the graph list is always
ordered by increasing graph ids. When creating a new graph, pick a free
id which is not allocated.

Update unit tests to ensure it works as expected.

Signed-off-by: Robin Jarry <rjarry@redhat.com>
---

Notes:
    v3:
    
    * Fixed invalid logic in graph_insert_ordered.
    * Updated unit test to ensure head/tail/middle insertion work (the test
      fails before fixing graph_insert_ordered).

 app/test/test_graph.c | 72 ++++++++++++++++++++++++++++++++++++
 lib/graph/graph.c     | 86 ++++++++++++++++++++++++++++++++++---------
 2 files changed, 141 insertions(+), 17 deletions(-)
  

Comments

Kiran Kumar Kokkilagadda June 18, 2024, 9:49 a.m. UTC | #1
From: Robin Jarry <rjarry@redhat.com>
Sent: Tuesday, June 18, 2024 2:53 PM
To: dev@dpdk.org; Jerin Jacob <jerinj@marvell.com>; Kiran Kumar Kokkilagadda <kirankumark@marvell.com>; Nithin Kumar Dabilpuram <ndabilpuram@marvell.com>; Zhirun Yan <yanzhirun_163@163.com>
Subject: [EXTERNAL] [PATCH v3] graph: avoid id collisions

The graph id is determined based on a global variable that is incremented every time a graph is created, and decremented every time a graph is destroyed. This only works if graphs are destroyed in the reverse order in which they have been created. 


The graph id is determined based on a global variable that is

incremented every time a graph is created, and decremented every time

a graph is destroyed. This only works if graphs are destroyed in the

reverse order in which they have been created.



The following code produces duplicate graph IDs which can lead to

use-after-free bugs and other undefined behaviours:



  a = rte_graph_create(...); // id=0 graph_id=1

  b = rte_graph_create(...); // id=1 graph_id=2

  rte_graph_destroy(a);      // graph_id=1

  c = rte_graph_create(...); // id=1 graph_id=2 (duplicate with b)

  rte_graph_destroy(c);      // frees memory still used by b



Remove the global counter. Make sure that the graph list is always

ordered by increasing graph ids. When creating a new graph, pick a free

id which is not allocated.



Update unit tests to ensure it works as expected.



Signed-off-by: Robin Jarry <rjarry@redhat.com<mailto:rjarry@redhat.com>>



Acked-by: Kiran Kumar Kokkilagadda kirankumark@marvell.com<mailto:kirankumark@marvell.com>



Notes:

    v3:



    * Fixed invalid logic in graph_insert_ordered.

    * Updated unit test to ensure head/tail/middle insertion work (the test

      fails before fixing graph_insert_ordered).



 app/test/test_graph.c | 72 ++++++++++++++++++++++++++++++++++++

 lib/graph/graph.c     | 86 ++++++++++++++++++++++++++++++++++---------

 2 files changed, 141 insertions(+), 17 deletions(-)



diff --git a/app/test/test_graph.c b/app/test/test_graph.c

index b8409bc60497..2840a25b13b7 100644

--- a/app/test/test_graph.c

+++ b/app/test/test_graph.c

@@ -696,6 +696,77 @@ test_graph_clone(void)

              return ret;

 }



+static int

+test_graph_id_collisions(void)

+{

+           static const char *node_patterns[] = {"test_node_source1", "test_node00"};

+           struct rte_graph_param gconf = {

+                           .socket_id = SOCKET_ID_ANY,

+                           .nb_node_patterns = 2,

+                           .node_patterns = node_patterns,

+           };

+           rte_graph_t g1, g2, g3, g4;

+

+           g1 = rte_graph_create("worker1", &gconf);

+           if (g1 == RTE_GRAPH_ID_INVALID) {

+                           printf("Graph 1 creation failed with error = %d\n", rte_errno);

+                           return -1;

+           }

+           g2 = rte_graph_create("worker2", &gconf);

+           if (g2 == RTE_GRAPH_ID_INVALID) {

+                           printf("Graph 2 creation failed with error = %d\n", rte_errno);

+                           return -1;

+           }

+           g3 = rte_graph_create("worker3", &gconf);

+           if (g3 == RTE_GRAPH_ID_INVALID) {

+                           printf("Graph 3 creation failed with error = %d\n", rte_errno);

+                           return -1;

+           }

+           if (g1 == g2 || g2 == g3 || g1 == g3) {

+                           printf("Graph ids should be different\n");

+                           return -1;

+           }

+           if (rte_graph_destroy(g2) < 0) {

+                           printf("Graph 2 suppression failed\n");

+                           return -1;

+           }

+           g4 = rte_graph_create("worker4", &gconf);

+           if (g4 == RTE_GRAPH_ID_INVALID) {

+                           printf("Graph 4 creation failed with error = %d\n", rte_errno);

+                           return -1;

+           }

+           if (g1 == g3 || g1 == g4 || g3 == g4) {

+                           printf("Graph ids should be different\n");

+                           return -1;

+           }

+           g2 = rte_graph_clone(g1, "worker2", &gconf);

+           if (g2 == RTE_GRAPH_ID_INVALID) {

+                           printf("Graph 4 creation failed with error = %d\n", rte_errno);

+                           return -1;

+           }

+           if (g1 == g2 || g1 == g3 || g1 == g4 || g2 == g3 || g2 == g4 || g3 == g4) {

+                           printf("Graph ids should be different\n");

+                           return -1;

+           }

+           if (rte_graph_destroy(g1) < 0) {

+                           printf("Graph 1 suppression failed\n");

+                           return -1;

+           }

+           if (rte_graph_destroy(g2) < 0) {

+                           printf("Graph 2 suppression failed\n");

+                           return -1;

+           }

+           if (rte_graph_destroy(g3) < 0) {

+                           printf("Graph 3 suppression failed\n");

+                           return -1;

+           }

+           if (rte_graph_destroy(g4) < 0) {

+                           printf("Graph 4 suppression failed\n");

+                           return -1;

+           }

+           return 0;

+}

+

 static int

 test_graph_model_mcore_dispatch_node_lcore_affinity_set(void)

 {

@@ -977,6 +1048,7 @@ static struct unit_test_suite graph_testsuite = {

                             TEST_CASE(test_lookup_functions),

                             TEST_CASE(test_create_graph),

                             TEST_CASE(test_graph_clone),

+                           TEST_CASE(test_graph_id_collisions),

                            TEST_CASE(test_graph_model_mcore_dispatch_node_lcore_affinity_set),

                            TEST_CASE(test_graph_model_mcore_dispatch_core_bind_unbind),

                             TEST_CASE(test_graph_worker_model_set_get),

diff --git a/lib/graph/graph.c b/lib/graph/graph.c

index 147bc6c685c5..d5b8c9f918cf 100644

--- a/lib/graph/graph.c

+++ b/lib/graph/graph.c

@@ -19,11 +19,54 @@



 static struct graph_head graph_list = STAILQ_HEAD_INITIALIZER(graph_list);

 static rte_spinlock_t graph_lock = RTE_SPINLOCK_INITIALIZER;

-static rte_graph_t graph_id;

-

-#define GRAPH_ID_CHECK(id) ID_CHECK(id, graph_id)



 /* Private functions */

+static struct graph *

+graph_from_id(rte_graph_t id)

+{

+           struct graph *graph;

+           STAILQ_FOREACH(graph, &graph_list, next) {

+                           if (graph->id == id)

+                                          return graph;

+           }

+           rte_errno = EINVAL;

+           return NULL;

+}

+

+static rte_graph_t

+graph_next_free_id(void)

+{

+           struct graph *graph;

+           rte_graph_t id = 0;

+

+           STAILQ_FOREACH(graph, &graph_list, next) {

+                           if (id < graph->id)

+                                          break;

+                           id = graph->id + 1;

+           }

+

+           return id;

+}

+

+static void

+graph_insert_ordered(struct graph *graph)

+{

+           struct graph *after, *g;

+

+           after = NULL;

+           STAILQ_FOREACH(g, &graph_list, next) {

+                           if (g->id < graph->id)

+                                          after = g;

+                           else if (g->id > graph->id)

+                                          break;

+           }

+           if (after == NULL) {

+                           STAILQ_INSERT_HEAD(&graph_list, graph, next);

+           } else {

+                           STAILQ_INSERT_AFTER(&graph_list, after, graph, next);

+           }

+}

+

 struct graph_head *

 graph_list_head_get(void)

 {

@@ -279,7 +322,8 @@ rte_graph_model_mcore_dispatch_core_bind(rte_graph_t id, int lcore)

 {

              struct graph *graph;



-            GRAPH_ID_CHECK(id);

+           if (graph_from_id(id) == NULL)

+                           goto fail;

              if (!rte_lcore_is_enabled(lcore))

                             SET_ERR_JMP(ENOLINK, fail, "lcore %d not enabled", lcore);



@@ -309,7 +353,8 @@ rte_graph_model_mcore_dispatch_core_unbind(rte_graph_t id)

 {

              struct graph *graph;



-            GRAPH_ID_CHECK(id);

+           if (graph_from_id(id) == NULL)

+                           goto fail;

              STAILQ_FOREACH(graph, &graph_list, next)

                             if (graph->id == id)

                                            break;

@@ -406,7 +451,7 @@ rte_graph_create(const char *name, struct rte_graph_param *prm)

              graph->socket = prm->socket_id;

              graph->src_node_count = src_node_count;

              graph->node_count = graph_nodes_count(graph);

-            graph->id = graph_id;

+           graph->id = graph_next_free_id();

              graph->parent_id = RTE_GRAPH_ID_INVALID;

              graph->lcore_id = RTE_MAX_LCORE;

              graph->num_pkt_to_capture = prm->num_pkt_to_capture;

@@ -422,8 +467,7 @@ rte_graph_create(const char *name, struct rte_graph_param *prm)

                             goto graph_mem_destroy;



              /* All good, Lets add the graph to the list */

-            graph_id++;

-            STAILQ_INSERT_TAIL(&graph_list, graph, next);

+           graph_insert_ordered(graph);



              graph_spinlock_unlock();

              return graph->id;

@@ -467,7 +511,6 @@ rte_graph_destroy(rte_graph_t id)

                                            graph_cleanup(graph);

                                            STAILQ_REMOVE(&graph_list, graph, graph, next);

                                            free(graph);

-                                           graph_id--;

                                            goto done;

                             }

                             graph = tmp;

@@ -520,7 +563,7 @@ graph_clone(struct graph *parent_graph, const char *name, struct rte_graph_param

              graph->parent_id = parent_graph->id;

              graph->lcore_id = parent_graph->lcore_id;

              graph->socket = parent_graph->socket;

-            graph->id = graph_id;

+           graph->id = graph_next_free_id();



              /* Allocate the Graph fast path memory and populate the data */

              if (graph_fp_mem_create(graph))

@@ -539,8 +582,7 @@ graph_clone(struct graph *parent_graph, const char *name, struct rte_graph_param

                             goto graph_mem_destroy;



              /* All good, Lets add the graph to the list */

-            graph_id++;

-            STAILQ_INSERT_TAIL(&graph_list, graph, next);

+           graph_insert_ordered(graph);



              graph_spinlock_unlock();

              return graph->id;

@@ -561,7 +603,8 @@ rte_graph_clone(rte_graph_t id, const char *name, struct rte_graph_param *prm)

 {

              struct graph *graph;



-            GRAPH_ID_CHECK(id);

+           if (graph_from_id(id) == NULL)

+                           goto fail;

              STAILQ_FOREACH(graph, &graph_list, next)

                             if (graph->id == id)

                                            return graph_clone(graph, name, prm);

@@ -587,7 +630,8 @@ rte_graph_id_to_name(rte_graph_t id)

 {

              struct graph *graph;



-            GRAPH_ID_CHECK(id);

+           if (graph_from_id(id) == NULL)

+                           goto fail;

              STAILQ_FOREACH(graph, &graph_list, next)

                             if (graph->id == id)

                                            return graph->name;

@@ -604,7 +648,8 @@ rte_graph_node_get(rte_graph_t gid, uint32_t nid)

              rte_graph_off_t off;

              rte_node_t count;



-            GRAPH_ID_CHECK(gid);

+           if (graph_from_id(gid) == NULL)

+                           goto fail;

              STAILQ_FOREACH(graph, &graph_list, next)

                             if (graph->id == gid) {

                                            rte_graph_foreach_node(count, off, graph->graph,

@@ -747,7 +792,8 @@ graph_scan_dump(FILE *f, rte_graph_t id, bool all)

              struct graph *graph;



              RTE_VERIFY(f);

-            GRAPH_ID_CHECK(id);

+           if (graph_from_id(id) == NULL)

+                           goto fail;



              STAILQ_FOREACH(graph, &graph_list, next) {

                             if (all == true) {

@@ -776,7 +822,13 @@ rte_graph_list_dump(FILE *f)

 rte_graph_t

 rte_graph_max_count(void)

 {

-            return graph_id;

+           struct graph *graph;

+           rte_graph_t count = 0;

+

+           STAILQ_FOREACH(graph, &graph_list, next)

+                           count++;

+

+           return count;

 }



 RTE_LOG_REGISTER_DEFAULT(rte_graph_logtype, INFO);

--

2.45.2
  
David Marchand June 18, 2024, 1:13 p.m. UTC | #2
On Tue, Jun 18, 2024 at 11:24 AM Robin Jarry <rjarry@redhat.com> wrote:
>
> The graph id is determined based on a global variable that is
> incremented every time a graph is created, and decremented every time
> a graph is destroyed. This only works if graphs are destroyed in the
> reverse order in which they have been created.
>
> The following code produces duplicate graph IDs which can lead to
> use-after-free bugs and other undefined behaviours:
>
>   a = rte_graph_create(...); // id=0 graph_id=1
>   b = rte_graph_create(...); // id=1 graph_id=2
>   rte_graph_destroy(a);      // graph_id=1
>   c = rte_graph_create(...); // id=1 graph_id=2 (duplicate with b)
>   rte_graph_destroy(c);      // frees memory still used by b
>
> Remove the global counter. Make sure that the graph list is always
> ordered by increasing graph ids. When creating a new graph, pick a free
> id which is not allocated.
>
> Update unit tests to ensure it works as expected.

Fixes: a91fecc19c5c ("graph: implement create and destroy")
Cc: stable@dpdk.org

>
> Signed-off-by: Robin Jarry <rjarry@redhat.com>

Acked-by: Kiran Kumar Kokkilagadda <kirankumark@marvell.com>

Applied, thanks.
  

Patch

diff --git a/app/test/test_graph.c b/app/test/test_graph.c
index b8409bc60497..2840a25b13b7 100644
--- a/app/test/test_graph.c
+++ b/app/test/test_graph.c
@@ -696,6 +696,77 @@  test_graph_clone(void)
 	return ret;
 }
 
+static int
+test_graph_id_collisions(void)
+{
+	static const char *node_patterns[] = {"test_node_source1", "test_node00"};
+	struct rte_graph_param gconf = {
+		.socket_id = SOCKET_ID_ANY,
+		.nb_node_patterns = 2,
+		.node_patterns = node_patterns,
+	};
+	rte_graph_t g1, g2, g3, g4;
+
+	g1 = rte_graph_create("worker1", &gconf);
+	if (g1 == RTE_GRAPH_ID_INVALID) {
+		printf("Graph 1 creation failed with error = %d\n", rte_errno);
+		return -1;
+	}
+	g2 = rte_graph_create("worker2", &gconf);
+	if (g2 == RTE_GRAPH_ID_INVALID) {
+		printf("Graph 2 creation failed with error = %d\n", rte_errno);
+		return -1;
+	}
+	g3 = rte_graph_create("worker3", &gconf);
+	if (g3 == RTE_GRAPH_ID_INVALID) {
+		printf("Graph 3 creation failed with error = %d\n", rte_errno);
+		return -1;
+	}
+	if (g1 == g2 || g2 == g3 || g1 == g3) {
+		printf("Graph ids should be different\n");
+		return -1;
+	}
+	if (rte_graph_destroy(g2) < 0) {
+		printf("Graph 2 suppression failed\n");
+		return -1;
+	}
+	g4 = rte_graph_create("worker4", &gconf);
+	if (g4 == RTE_GRAPH_ID_INVALID) {
+		printf("Graph 4 creation failed with error = %d\n", rte_errno);
+		return -1;
+	}
+	if (g1 == g3 || g1 == g4 || g3 == g4) {
+		printf("Graph ids should be different\n");
+		return -1;
+	}
+	g2 = rte_graph_clone(g1, "worker2", &gconf);
+	if (g2 == RTE_GRAPH_ID_INVALID) {
+		printf("Graph 4 creation failed with error = %d\n", rte_errno);
+		return -1;
+	}
+	if (g1 == g2 || g1 == g3 || g1 == g4 || g2 == g3 || g2 == g4 || g3 == g4) {
+		printf("Graph ids should be different\n");
+		return -1;
+	}
+	if (rte_graph_destroy(g1) < 0) {
+		printf("Graph 1 suppression failed\n");
+		return -1;
+	}
+	if (rte_graph_destroy(g2) < 0) {
+		printf("Graph 2 suppression failed\n");
+		return -1;
+	}
+	if (rte_graph_destroy(g3) < 0) {
+		printf("Graph 3 suppression failed\n");
+		return -1;
+	}
+	if (rte_graph_destroy(g4) < 0) {
+		printf("Graph 4 suppression failed\n");
+		return -1;
+	}
+	return 0;
+}
+
 static int
 test_graph_model_mcore_dispatch_node_lcore_affinity_set(void)
 {
@@ -977,6 +1048,7 @@  static struct unit_test_suite graph_testsuite = {
 		TEST_CASE(test_lookup_functions),
 		TEST_CASE(test_create_graph),
 		TEST_CASE(test_graph_clone),
+		TEST_CASE(test_graph_id_collisions),
 		TEST_CASE(test_graph_model_mcore_dispatch_node_lcore_affinity_set),
 		TEST_CASE(test_graph_model_mcore_dispatch_core_bind_unbind),
 		TEST_CASE(test_graph_worker_model_set_get),
diff --git a/lib/graph/graph.c b/lib/graph/graph.c
index 147bc6c685c5..d5b8c9f918cf 100644
--- a/lib/graph/graph.c
+++ b/lib/graph/graph.c
@@ -19,11 +19,54 @@ 
 
 static struct graph_head graph_list = STAILQ_HEAD_INITIALIZER(graph_list);
 static rte_spinlock_t graph_lock = RTE_SPINLOCK_INITIALIZER;
-static rte_graph_t graph_id;
-
-#define GRAPH_ID_CHECK(id) ID_CHECK(id, graph_id)
 
 /* Private functions */
+static struct graph *
+graph_from_id(rte_graph_t id)
+{
+	struct graph *graph;
+	STAILQ_FOREACH(graph, &graph_list, next) {
+		if (graph->id == id)
+			return graph;
+	}
+	rte_errno = EINVAL;
+	return NULL;
+}
+
+static rte_graph_t
+graph_next_free_id(void)
+{
+	struct graph *graph;
+	rte_graph_t id = 0;
+
+	STAILQ_FOREACH(graph, &graph_list, next) {
+		if (id < graph->id)
+			break;
+		id = graph->id + 1;
+	}
+
+	return id;
+}
+
+static void
+graph_insert_ordered(struct graph *graph)
+{
+	struct graph *after, *g;
+
+	after = NULL;
+	STAILQ_FOREACH(g, &graph_list, next) {
+		if (g->id < graph->id)
+			after = g;
+		else if (g->id > graph->id)
+			break;
+	}
+	if (after == NULL) {
+		STAILQ_INSERT_HEAD(&graph_list, graph, next);
+	} else {
+		STAILQ_INSERT_AFTER(&graph_list, after, graph, next);
+	}
+}
+
 struct graph_head *
 graph_list_head_get(void)
 {
@@ -279,7 +322,8 @@  rte_graph_model_mcore_dispatch_core_bind(rte_graph_t id, int lcore)
 {
 	struct graph *graph;
 
-	GRAPH_ID_CHECK(id);
+	if (graph_from_id(id) == NULL)
+		goto fail;
 	if (!rte_lcore_is_enabled(lcore))
 		SET_ERR_JMP(ENOLINK, fail, "lcore %d not enabled", lcore);
 
@@ -309,7 +353,8 @@  rte_graph_model_mcore_dispatch_core_unbind(rte_graph_t id)
 {
 	struct graph *graph;
 
-	GRAPH_ID_CHECK(id);
+	if (graph_from_id(id) == NULL)
+		goto fail;
 	STAILQ_FOREACH(graph, &graph_list, next)
 		if (graph->id == id)
 			break;
@@ -406,7 +451,7 @@  rte_graph_create(const char *name, struct rte_graph_param *prm)
 	graph->socket = prm->socket_id;
 	graph->src_node_count = src_node_count;
 	graph->node_count = graph_nodes_count(graph);
-	graph->id = graph_id;
+	graph->id = graph_next_free_id();
 	graph->parent_id = RTE_GRAPH_ID_INVALID;
 	graph->lcore_id = RTE_MAX_LCORE;
 	graph->num_pkt_to_capture = prm->num_pkt_to_capture;
@@ -422,8 +467,7 @@  rte_graph_create(const char *name, struct rte_graph_param *prm)
 		goto graph_mem_destroy;
 
 	/* All good, Lets add the graph to the list */
-	graph_id++;
-	STAILQ_INSERT_TAIL(&graph_list, graph, next);
+	graph_insert_ordered(graph);
 
 	graph_spinlock_unlock();
 	return graph->id;
@@ -467,7 +511,6 @@  rte_graph_destroy(rte_graph_t id)
 			graph_cleanup(graph);
 			STAILQ_REMOVE(&graph_list, graph, graph, next);
 			free(graph);
-			graph_id--;
 			goto done;
 		}
 		graph = tmp;
@@ -520,7 +563,7 @@  graph_clone(struct graph *parent_graph, const char *name, struct rte_graph_param
 	graph->parent_id = parent_graph->id;
 	graph->lcore_id = parent_graph->lcore_id;
 	graph->socket = parent_graph->socket;
-	graph->id = graph_id;
+	graph->id = graph_next_free_id();
 
 	/* Allocate the Graph fast path memory and populate the data */
 	if (graph_fp_mem_create(graph))
@@ -539,8 +582,7 @@  graph_clone(struct graph *parent_graph, const char *name, struct rte_graph_param
 		goto graph_mem_destroy;
 
 	/* All good, Lets add the graph to the list */
-	graph_id++;
-	STAILQ_INSERT_TAIL(&graph_list, graph, next);
+	graph_insert_ordered(graph);
 
 	graph_spinlock_unlock();
 	return graph->id;
@@ -561,7 +603,8 @@  rte_graph_clone(rte_graph_t id, const char *name, struct rte_graph_param *prm)
 {
 	struct graph *graph;
 
-	GRAPH_ID_CHECK(id);
+	if (graph_from_id(id) == NULL)
+		goto fail;
 	STAILQ_FOREACH(graph, &graph_list, next)
 		if (graph->id == id)
 			return graph_clone(graph, name, prm);
@@ -587,7 +630,8 @@  rte_graph_id_to_name(rte_graph_t id)
 {
 	struct graph *graph;
 
-	GRAPH_ID_CHECK(id);
+	if (graph_from_id(id) == NULL)
+		goto fail;
 	STAILQ_FOREACH(graph, &graph_list, next)
 		if (graph->id == id)
 			return graph->name;
@@ -604,7 +648,8 @@  rte_graph_node_get(rte_graph_t gid, uint32_t nid)
 	rte_graph_off_t off;
 	rte_node_t count;
 
-	GRAPH_ID_CHECK(gid);
+	if (graph_from_id(gid) == NULL)
+		goto fail;
 	STAILQ_FOREACH(graph, &graph_list, next)
 		if (graph->id == gid) {
 			rte_graph_foreach_node(count, off, graph->graph,
@@ -747,7 +792,8 @@  graph_scan_dump(FILE *f, rte_graph_t id, bool all)
 	struct graph *graph;
 
 	RTE_VERIFY(f);
-	GRAPH_ID_CHECK(id);
+	if (graph_from_id(id) == NULL)
+		goto fail;
 
 	STAILQ_FOREACH(graph, &graph_list, next) {
 		if (all == true) {
@@ -776,7 +822,13 @@  rte_graph_list_dump(FILE *f)
 rte_graph_t
 rte_graph_max_count(void)
 {
-	return graph_id;
+	struct graph *graph;
+	rte_graph_t count = 0;
+
+	STAILQ_FOREACH(graph, &graph_list, next)
+		count++;
+
+	return count;
 }
 
 RTE_LOG_REGISTER_DEFAULT(rte_graph_logtype, INFO);