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udp: ipv4: fix potential use after free in udp_v4_early_demux()
authorEric Dumazet <edumazet@google.com>
Wed, 11 Dec 2013 16:10:05 +0000 (08:10 -0800)
committerDavid S. Miller <davem@davemloft.net>
Wed, 11 Dec 2013 21:10:14 +0000 (16:10 -0500)
commit610438b74496b2986a9025f8e23c134cb638e338
treea04eec671093bb727ba8aacb8da6a289e6b77f45tree | snapshot
parentce232ce01d61b184202bb185103d119820e1260ccommit | diff
udp: ipv4: fix potential use after free in udp_v4_early_demux()

pskb_may_pull() can reallocate skb->head, we need to move the
initialization of iph and uh pointers after its call.

Fixes: 421b3885bf6d ("udp: ipv4: Add udp early demux")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Shawn Bohrer <sbohrer@rgmadvisors.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/udp.c diff | blob | history
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