[PATCH v5 06/52] node: replace strerror with reentrant version

[Dengdui Huang]

The function strerror() is insecure in a multi-thread environment.
This patch uses strerror_r() to replace it.

Signed-off-by: Dengdui Huang <huangdengdui at huawei.com>
Acked-by: Chengwen Feng <fengchengwen at huawei.com>
Acked-by: Morten Brørup <mb at smartsharesystems.com>
Acked-by: Huisong Li <lihuisong at huawei.com>
---
 lib/node/kernel_tx.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/node/kernel_tx.c b/lib/node/kernel_tx.c
index 3a96741622..3a76522799 100644
--- a/lib/node/kernel_tx.c
+++ b/lib/node/kernel_tx.c
@@ -20,6 +20,7 @@ static __rte_always_inline void
 kernel_tx_process_mbuf(struct rte_node *node, struct rte_mbuf **mbufs, uint16_t cnt)
 {
 	kernel_tx_node_ctx_t *ctx = (kernel_tx_node_ctx_t *)node->ctx;
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct sockaddr_in sin = {0};
 	struct rte_ipv4_hdr *ip4;
 	size_t len;
@@ -35,8 +36,11 @@ kernel_tx_process_mbuf(struct rte_node *node, struct rte_mbuf **mbufs, uint16_t
 		sin.sin_port = 0;
 		sin.sin_addr.s_addr = ip4->dst_addr;
 
-		if (sendto(ctx->sock, buf, len, 0, (struct sockaddr *)&sin, sizeof(sin)) < 0)
-			node_err("kernel_tx", "Unable to send packets: %s", strerror(errno));
+		if (sendto(ctx->sock, buf, len, 0, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
+			node_err("kernel_tx", "Unable to send packets: %s", errmsg);
+		}
 	}
 }
 
-- 
2.33.0