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| author | Jason Wang <jasowang@redhat.com> | 2013-11-01 15:01:10 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-02 02:16:07 -0400 |
| commit | 6f092343855a71e03b8d209815d8c45bf3a27fcd (patch) | |
| tree | aeb6de3e6587b60c913c0e779c313ee0bd2a7b00 /net | |
| parent | 2e19ef02511224cc415f49e1b38928b1cfac49be (diff) | |
| download | linux-stable-6f092343855a71e03b8d209815d8c45bf3a27fcd.tar.gz linux-stable-6f092343855a71e03b8d209815d8c45bf3a27fcd.tar.bz2 linux-stable-6f092343855a71e03b8d209815d8c45bf3a27fcd.zip | |
net: flow_dissector: fail on evil iph->ihl
We don't validate iph->ihl which may lead a dead loop if we meet a IPIP
skb whose iph->ihl is zero. Fix this by failing immediately when iph->ihl
is evil (less than 5).
This issue were introduced by commit ec5efe7946280d1e84603389a1030ccec0a767ae
(rps: support IPIP encapsulation).
Cc: Eric Dumazet <edumazet@google.com>
Cc: Petr Matousek <pmatouse@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/flow_dissector.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 8d7d0dd72db2..143b6fdb9647 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -40,7 +40,7 @@ again: struct iphdr _iph; ip: iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); - if (!iph) + if (!iph || iph->ihl < 5) return false; if (ip_is_fragment(iph)) |