commit 65d786c21bf8140dac83563306f46fe0b13a9aaa
author Gustavo A. R. Silva <garsilva@embeddedor.com> Tue May 23 18:18:37 2017 -0500
committer David S. Miller <davem@davemloft.net> Thu May 25 12:54:02 2017 -0400
tree d06216d5b8d3fa595687e5351c9768374191f167
parent 11387fe4a98f75d1f4cdb3efe3b42b19205c9df5

net: fix potential null pointer dereference

Add null check to avoid a potential null pointer dereference.

Addresses-Coverity-ID: 1408831
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/gtp.c

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 4fea1b3..7b652bb 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -873,7 +873,7 @@
 
 	/* Check if there's an existing gtpX device to configure */
 	dev = dev_get_by_index_rcu(net, nla_get_u32(nla[GTPA_LINK]));
-	if (dev->netdev_ops == &gtp_netdev_ops)
+	if (dev && dev->netdev_ops == &gtp_netdev_ops)
 		gtp = netdev_priv(dev);
 
 	put_net(net);