[v3] net/igc: fix memory illegal accesses

  From: Alvin Zhang <alvinx.zhang@intel.com>

Fix some out-of-bounds memory issues, they may lead to wrong results
or affect application stability.

Coverity issue: 357759, 357713
Fixes: bd3fcf0d0fa1 (net/igc: support RSS)
Cc: stable@dpdk.org

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---

V2: update git log
V3: update git log

 drivers/net/igc/igc_ethdev.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
  

On 05/08, alvinx.zhang@intel.com wrote:
>From: Alvin Zhang <alvinx.zhang@intel.com>
>
>Fix some out-of-bounds memory issues, they may lead to wrong results
>or affect application stability.
>
>Coverity issue: 357759, 357713
>Fixes: bd3fcf0d0fa1 (net/igc: support RSS)
>Cc: stable@dpdk.org
>
>Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
>---
>
>V2: update git log
>V3: update git log
>
> drivers/net/igc/igc_ethdev.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/igc/igc_ethdev.c b/drivers/net/igc/igc_ethdev.c
>index 16d98c6..6ab3ee9 100644
>--- a/drivers/net/igc/igc_ethdev.c
>+++ b/drivers/net/igc/igc_ethdev.c
>@@ -2266,6 +2266,8 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
> 		return -EINVAL;
> 	}
> 
>+	RTE_BUILD_BUG_ON(ETH_RSS_RETA_SIZE_128 % IGC_RSS_RDT_REG_SIZE);
>+
> 	/* set redirection table */
> 	for (i = 0; i < ETH_RSS_RETA_SIZE_128; i += IGC_RSS_RDT_REG_SIZE) {
> 		union igc_rss_reta_reg reta, reg;
>@@ -2278,7 +2280,8 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
> 				IGC_RSS_RDT_REG_SIZE_MASK);
> 
> 		/* if no need to update the register */
>-		if (!mask)
>+		if (!mask ||
>+		    shift > (RTE_RETA_GROUP_SIZE - IGC_RSS_RDT_REG_SIZE))
> 			continue;
> 
> 		/* check mask whether need to read the register value first */
>@@ -2289,6 +2292,7 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
> 					IGC_RETA(i / IGC_RSS_RDT_REG_SIZE));
> 
> 		/* update the register */
>+		RTE_BUILD_BUG_ON(sizeof(reta.bytes) != IGC_RSS_RDT_REG_SIZE);
> 		for (j = 0; j < IGC_RSS_RDT_REG_SIZE; j++) {
> 			if (mask & (1u << j))
> 				reta.bytes[j] =
>@@ -2318,6 +2322,8 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
> 		return -EINVAL;
> 	}
> 
>+	RTE_BUILD_BUG_ON(ETH_RSS_RETA_SIZE_128 % IGC_RSS_RDT_REG_SIZE);
>+
> 	/* read redirection table */
> 	for (i = 0; i < ETH_RSS_RETA_SIZE_128; i += IGC_RSS_RDT_REG_SIZE) {
> 		union igc_rss_reta_reg reta;
>@@ -2330,10 +2336,12 @@ static int eth_igc_vlan_tpid_set(struct rte_eth_dev *dev,
> 				IGC_RSS_RDT_REG_SIZE_MASK);
> 
> 		/* if no need to read register */
>-		if (!mask)
>+		if (!mask ||
>+		    shift > (RTE_RETA_GROUP_SIZE - IGC_RSS_RDT_REG_SIZE))
> 			continue;
> 
> 		/* read register and get the queue index */
>+		RTE_BUILD_BUG_ON(sizeof(reta.bytes) != IGC_RSS_RDT_REG_SIZE);
> 		reta.dword = IGC_READ_REG_LE_VALUE(hw,
> 				IGC_RETA(i / IGC_RSS_RDT_REG_SIZE));
> 		for (j = 0; j < IGC_RSS_RDT_REG_SIZE; j++) {
>-- 
>1.8.3.1
>

Applied to dpdk-next-net-intel, Thanks.