confile: safely clean previous value in set_config_net_ipv4_gateway()

Link: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32586Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

confile: safely clean previous value in set_config_net_ipv4_gateway()
9d5a073d · Christian Brauner · ed3a03cb · 9d5a073d
Unverified Commit 9d5a073d authored Mar 28, 2021 by Christian Brauner
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confile.c src/lxc/confile.c +2 -3

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--- a/src/lxc/confile.c
+++ b/src/lxc/confile.c
@@ -698,10 +698,9 @@ static int set_config_net_ipv4_gateway(const char *key, const char *value,
 	if (!netdev)
 		return ret_errno(EINVAL);
+	clr_config_net_ipv4_gateway(key, lxc_conf, data);
 	if (lxc_config_value_empty(value))
-		return clr_config_net_ipv4_gateway(key, lxc_conf, data);
+		return 0;
-	free(netdev->ipv4_gateway);
 	if (strequal(value, "auto")) {
 		netdev->ipv4_gateway = NULL;