From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 4 May 2013 17:25:11 +0000 (-0700)
Subject: ipc: fix double sem unlock in semctl error path
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~38^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fbfd1d2862a8316c7191bc551c6a842e6918abb0;p=pandora-kernel.git

ipc: fix double sem unlock in semctl error path

Fix another ipc locking buglet introduced by the scalability patches:
when semctl_down() was changed to delay the semaphore locking, one error
path for security_sem_semctl() went through the semaphore unlock logic
even though the semaphore had never been locked.

Introduced by commit 16df3674efe3 ("ipc,sem: do not hold ipc lock more
than necessary")

Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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