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authorLorenzo Colitti <lorenzo@google.com>2016-12-22 18:33:57 +0300
committerDavid S. Miller <davem@davemloft.net>2016-12-22 19:15:10 +0300
commit7d99569460eae28b187d574aec930a4cf8b90441 (patch)
tree99477f48a607f4825a46f987a5f26c40b3041444
parent551cde192343a10c8fbd57c4cc8f0c4b6cd307e4 (diff)
downloadlinux-7d99569460eae28b187d574aec930a4cf8b90441.tar.xz
net: ipv4: Don't crash if passing a null sk to ip_do_redirect.
Commit e2d118a1cb5e ("net: inet: Support UID-based routing in IP protocols.") made ip_do_redirect call sock_net(sk) to determine the network namespace of the passed-in socket. This crashes if sk is NULL. Fix this by getting the network namespace from the skb instead. Fixes: e2d118a1cb5e ("net: inet: Support UID-based routing in IP protocols.") Signed-off-by: Lorenzo Colitti <lorenzo@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/route.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index fa5c037227cb..9eabf490133a 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -798,6 +798,7 @@ static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buf
struct rtable *rt;
struct flowi4 fl4;
const struct iphdr *iph = (const struct iphdr *) skb->data;
+ struct net *net = dev_net(skb->dev);
int oif = skb->dev->ifindex;
u8 tos = RT_TOS(iph->tos);
u8 prot = iph->protocol;
@@ -805,7 +806,7 @@ static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buf
rt = (struct rtable *) dst;
- __build_flow_key(sock_net(sk), &fl4, sk, iph, oif, tos, prot, mark, 0);
+ __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0);
__ip_do_redirect(rt, skb, &fl4, true);
}