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authorEric Dumazet <edumazet@google.com>2018-01-19 06:59:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-31 14:55:54 +0300
commita44d91150f3365968f6d83abfb76c4dd92bda168 (patch)
tree059e5115bb23460f4f88e5138fbec5c79071f84d /.gitignore
parent0ae16964f2154266f411b639ef101869ac3ae0b5 (diff)
downloadlinux-a44d91150f3365968f6d83abfb76c4dd92bda168.tar.xz
net: qdisc_pkt_len_init() should be more robust
[ Upstream commit 7c68d1a6b4db9012790af7ac0f0fdc0d2083422a ] Without proper validation of DODGY packets, we might very well feed qdisc_pkt_len_init() with invalid GSO packets. tcp_hdrlen() might access out-of-bound data, so let's use skb_header_pointer() and proper checks. Whole story is described in commit d0c081b49137 ("flow_dissector: properly cap thoff field") We have the goal of validating DODGY packets earlier in the stack, so we might very well revert this fix in the future. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: Jason Wang <jasowang@redhat.com> Reported-by: syzbot+9da69ebac7dddd804552@syzkaller.appspotmail.com Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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