xfrm6: Fix ICMPv6 and MH header checks in _decode_session6

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Ensure there's enough data left prior calling pskb_may_pull(). If
skb->data was already advanced, we'll call pskb_may_pull() with a
negative value converted to unsigned int -- leading to a huge
positive value. That won't matter in practice as pskb_may_pull()
will likely fail in this case, but it leads to underflow reports on
kernels handling such kind of over-/underflows, e.g. a PaX enabled
kernel instrumented with the size_overflow plugin.

Reported-by: satmd <satmd@lain.at>
Reported-and-tested-by: Marcin Jurkowski <marcin1j@gmail.com>
Signed-off-by: Mathias Krause <mathias.krause@secunet.com>
Cc: PaX Team <pageexec@freemail.hu>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

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Mathias Krause 2015-09-11 09:57:20 +02:00 • committed by Steffen Klassert

parent 93efac3f2e

commit 04a6b8bfee

1 changed files with 4 additions and 2 deletions

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net/ipv6/xfrm6_policy.c

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