net/igc: fix boundary checks for RSS

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")

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
Reviewed-by: Jeff Guo <jia.guo@intel.com>

diff --git a/drivers/net/igc/igc_ethdev.c b/drivers/net/igc/igc_ethdev.c
index 16d98c6..6ab3ee9 100644 (file)
--- a/drivers/net/igc/igc_ethdev.c
+++ b/drivers/net/igc/igc_ethdev.c
@@ -2266,6 +2266,8 @@ eth_igc_rss_reta_update(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 @@ eth_igc_rss_reta_update(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 @@ eth_igc_rss_reta_update(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 @@ eth_igc_rss_reta_query(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 @@ eth_igc_rss_reta_query(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++) {