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authorEric Dumazet <edumazet@google.com>2016-01-27 03:59:42 +0300
committerDavid S. Miller <davem@davemloft.net>2016-01-29 23:14:20 +0300
commit63e51b6a24f1bee5363056b7aee3a468b12c546b (patch)
tree899fb9c04578375e57616076654ab4dd528b4cc4 /net/ipv4/ip_input.c
parentb64438853f4c29f2235124a1c879b5e242d1ae19 (diff)
downloadlinux-63e51b6a24f1bee5363056b7aee3a468b12c546b.tar.xz
ipv4: early demux should be aware of fragments
We should not assume a valid protocol header is present, as this is not the case for IPv4 fragments. Lets avoid extra cache line misses and potential bugs if we actually find a socket and incorrectly uses its dst. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_input.c')
-rw-r--r--net/ipv4/ip_input.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index b1209b63381f..d77eb0c3b684 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -316,7 +316,10 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
const struct iphdr *iph = ip_hdr(skb);
struct rtable *rt;
- if (sysctl_ip_early_demux && !skb_dst(skb) && !skb->sk) {
+ if (sysctl_ip_early_demux &&
+ !skb_dst(skb) &&
+ !skb->sk &&
+ !ip_is_fragment(iph)) {
const struct net_protocol *ipprot;
int protocol = iph->protocol;