[dpdk-dev] [PATCH] net/softnic: fix null pointer dereference

[dapengx . yu]

From: Dapeng Yu <dapengx...@intel.com>

When there is no "firmware" in arguments, the "firmware" pointer is
null, and will be dereferenced by rte_strscpy().

This patch moves the code block which copies character string from
"firmware" to "p->firmware" into the "if" statements where "firmware"
argument exists and it is duplicated successfully.

Coverity issue: 372136
Fixes: d8f852f5f369 ("net/softnic: fix memory leak in arguments parsing")
Cc: sta...@dpdk.org

Signed-off-by: Dapeng Yu <dapengx...@intel.com>
---
 drivers/net/softnic/rte_eth_softnic.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/net/softnic/rte_eth_softnic.c 
b/drivers/net/softnic/rte_eth_softnic.c
index 0aa7147b13..b3b55b9035 100644
--- a/drivers/net/softnic/rte_eth_softnic.c
+++ b/drivers/net/softnic/rte_eth_softnic.c
@@ -479,17 +479,19 @@ pmd_parse_args(struct pmd_params *p, const char *params)
                        &get_string, &firmware);
                if (ret < 0)
                        goto out_free;
-       }
-       if (rte_strscpy(p->firmware, firmware,
-                       sizeof(p->firmware)) < 0) {
-               PMD_LOG(WARNING,
-                       "\"%s\": firmware path should be shorter than %zu",
-                       firmware, sizeof(p->firmware));
+
+               if (rte_strscpy(p->firmware, firmware,
+                               sizeof(p->firmware)) < 0) {
+                       PMD_LOG(WARNING,
+                               "\"%s\": "
+                               "firmware path should be shorter than %zu",
+                               firmware, sizeof(p->firmware));
+                       free(firmware);
+                       ret = -EINVAL;
+                       goto out_free;
+               }
                free(firmware);
-               ret = -EINVAL;
-               goto out_free;
        }
-       free(firmware);
        /* Connection listening port (optional) */
        if (rte_kvargs_count(kvlist, PMD_PARAM_CONN_PORT) == 1) {
                ret = rte_kvargs_process(kvlist, PMD_PARAM_CONN_PORT,
-- 
2.27.0