From: Dmitry Shmidt <dimitrysh@google.com>
Date: Mon, 26 Nov 2012 20:50:50 +0000 (-0800)
Subject: ipv4: Check if dev_out is NULL in ip_route_output_slow()
X-Git-Tag: firefly_0821_release~7613^2~16
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b0dcb85864986085119a4a8ca927a1cfd7a98c16;p=firefly-linux-kernel-4.4.55.git

ipv4: Check if dev_out is NULL in ip_route_output_slow()

Change-Id: If04a8e99942dbe7e099e736dc87c2a49e1e778f9
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
---

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6b95f74a91d3..37be8f654866 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2751,10 +2751,15 @@ static struct rtable *ip_route_output_slow(struct net *net, struct flowi4 *fl4)
 	    res.type == RTN_UNICAST && !fl4->flowi4_oif)
 		fib_select_default(&res);
 
+	dev_out = FIB_RES_DEV(res);
+	if (dev_out == NULL) {
+		rth = ERR_PTR(-ENODEV);
+		goto out;
+	}
+
 	if (!fl4->saddr)
 		fl4->saddr = FIB_RES_PREFSRC(net, res);
 
-	dev_out = FIB_RES_DEV(res);
 	fl4->flowi4_oif = dev_out->ifindex;