[dpdk-dev] [PATCH v4] app/testpmd: fix copying the name of the dynflag

[Ori Kam <orika@mellanox.com>]

When working with testpmd and setting the dynflag name, we copy the
name given by the cmd to the dynflag name.

The issue is that the size of the dynflag name is smaller then the
string used by testpmd.

This commit solves this issue by checking that the length of the requested
flag name is not too long.

Coverity issue: 353610

Fixes: b57b66a97ebf ("app/testpmd: support mbuf dynamic flag")

Signed-off-by: Ori Kam <orika@mellanox.com>
---
V4:
 * Address ML comments
V3:
 * Fix style issue.
V2:
 * change to check the requested flag name.
---
 app/test-pmd/cmdline.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index dab22bc..45602cc 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -18867,14 +18867,18 @@ struct cmd_config_tx_dynf_specific_result {
 		return;
 	flag = rte_mbuf_dynflag_lookup(res->name, NULL);
 	if (flag <= 0) {
-		strcpy(desc_flag.name, res->name);
+		if (strlcpy(desc_flag.name, res->name,
+			    RTE_MBUF_DYN_NAMESIZE) >= RTE_MBUF_DYN_NAMESIZE) {
+			printf("Flag name too long\n");
+			return;
+		}
 		desc_flag.flags = 0;
 		flag = rte_mbuf_dynflag_register(&desc_flag);
 		if (flag < 0) {
 			printf("Can't register flag\n");
 			return;
 		}
-		strcpy(dynf_names[flag], res->name);
+		strcpy(dynf_names[flag], desc_flag.name);
 	}
 	old_port_flags = ports[res->port_id].mbuf_dynf;
 	if (!strcmp(res->value, "set")) {
-- 
1.8.3.1