[PATCH v2 30/44] common/mlx5: fix segment fault when parse devargs

[Chengwen Feng]

The rte_kvargs_process() was used to parse KV pairs, it also supports
to parse 'only keys' (e.g. socket_id) type. And the callback function
parameter 'value' is NULL when parsed 'only keys'.

This patch fixes segment fault when parse input args with 'only keys'.

Fixes: ad435d320473 ("common/mlx5: add bus-agnostic layer")
Cc: stable at dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen at huawei.com>
---
 drivers/common/mlx5/mlx5_common.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/common/mlx5/mlx5_common.c b/drivers/common/mlx5/mlx5_common.c
index 0ad14a48c7..e4cf829c14 100644
--- a/drivers/common/mlx5/mlx5_common.c
+++ b/drivers/common/mlx5/mlx5_common.c
@@ -365,6 +365,11 @@ devargs_class_handler(__rte_unused const char *key,
 	char *found;
 	char *refstr = NULL;
 
+	if (class_names == NULL) {
+		*ret = -EINVAL;
+		return *ret;
+	}
+
 	*ret = 0;
 	scratch = strdup(class_names);
 	if (scratch == NULL) {
-- 
2.17.1