tcp: fix more NULL deref after prequeue changes
authorEric Dumazet <edumazet@google.com>
Tue, 9 Dec 2014 17:56:08 +0000 (09:56 -0800)
committerDavid S. Miller <davem@davemloft.net>
Wed, 10 Dec 2014 02:38:44 +0000 (21:38 -0500)
commit0f85feae6b710ced3abad5b2b47d31dfcb956b62
tree17d1fadb2483724a83a814c33270cc94389890dc
parentf15650b7f94879667f253bc32de7431c1baf2d6e
tcp: fix more NULL deref after prequeue changes

When I cooked commit c3658e8d0f1 ("tcp: fix possible NULL dereference in
tcp_vX_send_reset()") I missed other spots we could deref a NULL
skb_dst(skb)

Again, if a socket is provided, we do not need skb_dst() to get a
pointer to network namespace : sock_net(sk) is good enough.

Reported-by: Dann Frazier <dann.frazier@canonical.com>
Bisected-by: Dann Frazier <dann.frazier@canonical.com>
Tested-by: Dann Frazier <dann.frazier@canonical.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: ca777eff51f7 ("tcp: remove dst refcount false sharing for prequeue mode")
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_ipv4.c
net/ipv6/tcp_ipv6.c