From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 11 Sep 2011 19:50:28 +0000 (+0200)
Subject: fix a null pointer deref bug
X-Git-Url: https://git.archive.openwrt.org/?p=project%2Fnetifd.git;a=commitdiff_plain;h=e70cc01c34a4a3faded4bbdd50b9b716bd2ca94c

fix a null pointer deref bug
---

diff --git a/proto-shell.c b/proto-shell.c
index bb42c98..7acb4c6 100644
--- a/proto-shell.c
+++ b/proto-shell.c
@@ -137,7 +137,8 @@ proto_shell_teardown_cb(struct uloop_process *p, int ret)
 
 	state = container_of(p, struct proto_shell_state, teardown_task);
 	state->proto.proto_event(&state->proto, IFPEV_DOWN);
-	device_remove_user(&state->l3_dev);
+	if (state->l3_dev.dev)
+		device_remove_user(&state->l3_dev);
 }
 
 static void