diff mbox series

[v3,1/5] telemetry: fix autotest failures on Alpine

Message ID 20230405160326.186921-2-bruce.richardson@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Thomas Monjalon
Headers
Series telemetry: remove variable length arrays |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Bruce Richardson April 5, 2023, 4:03 p.m. UTC 
  On Alpine linux, the telemetry_data_autotest was failing for the
test where we had dictionaries embedded in other dictionaries up
to three levels deep. Indications are that this issue is due to
excess data being stored on the stack, so replace stack-allocated
buffer data with dynamically allocated data in the case where we
are doing recursive processing of telemetry data structures into
json.

Bugzilla ID: 1177
Fixes: c933bb5177ca ("telemetry: support array values in data object")
Fixes: d2671e642a8e ("telemetry: support dict of dicts")
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

---
V2:
  set '\0' in newly malloc'ed buffer to ensure it always has valid
  string data.
---
 lib/telemetry/telemetry.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

Comments

Tyler Retzlaff April 7, 2023, 7:22 p.m. UTC | #1 
On Wed, Apr 05, 2023 at 05:03:22PM +0100, Bruce Richardson wrote:
> On Alpine linux, the telemetry_data_autotest was failing for the
> test where we had dictionaries embedded in other dictionaries up
> to three levels deep. Indications are that this issue is due to
> excess data being stored on the stack, so replace stack-allocated
> buffer data with dynamically allocated data in the case where we
> are doing recursive processing of telemetry data structures into
> json.
> 
> Bugzilla ID: 1177
> Fixes: c933bb5177ca ("telemetry: support array values in data object")
> Fixes: d2671e642a8e ("telemetry: support dict of dicts")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> 
> ---
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

(ack on latest version)
diff mbox series

Patch

diff --git a/lib/telemetry/telemetry.c b/lib/telemetry/telemetry.c
index 7bceadcee7..728a0bffd4 100644
--- a/lib/telemetry/telemetry.c
+++ b/lib/telemetry/telemetry.c
@@ -208,7 +208,11 @@  container_to_json(const struct rte_tel_data *d, char *out_buf, size_t buf_len)
 				break;
 			case RTE_TEL_CONTAINER:
 			{
-				char temp[buf_len];
+				char *temp = malloc(buf_len);
+				if (temp == NULL)
+					break;
+				*temp = '\0';  /* ensure valid string */
+
 				const struct container *cont =
 						&v->value.container;
 				if (container_to_json(cont->data,
@@ -219,6 +223,7 @@  container_to_json(const struct rte_tel_data *d, char *out_buf, size_t buf_len)
 							v->name, temp);
 				if (!cont->keep)
 					rte_tel_data_free(cont->data);
+				free(temp);
 				break;
 			}
 			}
@@ -275,7 +280,11 @@  output_json(const char *cmd, const struct rte_tel_data *d, int s)
 				break;
 			case RTE_TEL_CONTAINER:
 			{
-				char temp[buf_len];
+				char *temp = malloc(buf_len);
+				if (temp == NULL)
+					break;
+				*temp = '\0';  /* ensure valid string */
+
 				const struct container *cont =
 						&v->value.container;
 				if (container_to_json(cont->data,
@@ -286,6 +295,7 @@  output_json(const char *cmd, const struct rte_tel_data *d, int s)
 							v->name, temp);
 				if (!cont->keep)
 					rte_tel_data_free(cont->data);
+				free(temp);
 			}
 			}
 		}
@@ -311,7 +321,11 @@  output_json(const char *cmd, const struct rte_tel_data *d, int s)
 						buf_len, used,
 						d->data.array[i].uval);
 			else if (d->type == TEL_ARRAY_CONTAINER) {
-				char temp[buf_len];
+				char *temp = malloc(buf_len);
+				if (temp == NULL)
+					break;
+				*temp = '\0';  /* ensure valid string */
+
 				const struct container *rec_data =
 						&d->data.array[i].container;
 				if (container_to_json(rec_data->data,
@@ -321,6 +335,7 @@  output_json(const char *cmd, const struct rte_tel_data *d, int s)
 							buf_len, used, temp);
 				if (!rec_data->keep)
 					rte_tel_data_free(rec_data->data);
+				free(temp);
 			}
 		break;
 	}