net/dccp: fix use-after-free in dccp_invalid_packet

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[ Upstream commit 648f0c28df ]

pskb_may_pull() can reallocate skb->head, we need to reload dh pointer
in dccp_invalid_packet() or risk use after free.

Bug found by Andrey Konovalov using syzkaller.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

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Eric Dumazet 2016-11-28 06:26:49 -08:00 • committed by Ben Hutchings

parent 1e6f154d4c

commit 239ec383c5

1 changed files with 7 additions and 5 deletions

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net/dccp/ipv4.c

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