From: Davidlohr Bueso <davidlohr.bueso@hp.com>
Date: Wed, 11 Sep 2013 21:26:28 +0000 (-0700)
Subject: ipc, shm: guard against non-existant vma in shmdt(2)
X-Git-Tag: v3.12-rc1~52^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=530fcd16d87cd2417c472a581ba5a1e501556c86;p=pandora-kernel.git

ipc, shm: guard against non-existant vma in shmdt(2)

When !CONFIG_MMU there's a chance we can derefence a NULL pointer when the
VM area isn't found - check the return value of find_vma().

Also, remove the redundant -EINVAL return: retval is set to the proper
return code and *only* changed to 0, when we actually unmap the segments.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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