[PATCH 2/2] net/mlx5: fix miss null check in ETH devargs parsing

[Michael Baum]

The "mlx5_os_parse_eth_devargs()" function parses the ETH devargs into a
specific structure called "eth_da".
It gets structure called "devargs" as a member of EAL device containing
the relevant information.

When "devargs" structure is invalid, the function avoids parsing it.
However, when it valid but its field "args" is invalid, the function
tries to parse it and dereference to NULL pointer.

This patch adds check to avoid this NULL dereferencing.

Fixes: 919488fbfa71 ("net/mlx5: support Sub-Function")
Cc: xuemingl at nvidia.com
Cc: stable at dpdk.org

Signed-off-by: Michael Baum <michaelba at nvidia.com>
Acked-by: Matan Azrad <matan at nvidia.com>
---
 drivers/net/mlx5/linux/mlx5_os.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index ab7ffa0931..2b6741396d 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -2411,7 +2411,7 @@ mlx5_os_parse_eth_devargs(struct rte_device *dev,
 			dev->devargs->cls_str);
 		return -rte_errno;
 	}
-	if (eth_da->type == RTE_ETH_REPRESENTOR_NONE) {
+	if (eth_da->type == RTE_ETH_REPRESENTOR_NONE && dev->devargs->args) {
 		/* Parse legacy device argument */
 		ret = rte_eth_devargs_parse(dev->devargs->args, eth_da);
 		if (ret) {
-- 
2.25.1