xfrm: Fix stack-out-of-bounds read on socket policy lookup.

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commit ddc47e4404 upstream.

When we do tunnel or beet mode, we pass saddr and daddr from the
template to xfrm_state_find(), this is ok. On transport mode,
we pass the addresses from the flowi, assuming that the IP
addresses (and address family) don't change during transformation.
This assumption is wrong in the IPv4 mapped IPv6 case, packet
is IPv4 and template is IPv6.

Fix this by catching address family missmatches of the policy
and the flow already before we do the lookup.

Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Steffen Klassert 2017-11-29 06:53:55 +01:00 • committed by Greg Kroah-Hartman

parent d6b36a2616

commit 70c5e41f47

1 changed files with 7 additions and 1 deletions

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net/xfrm/xfrm_policy.c

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