From: Don Mullis <don.mullis@gmail.com>
Date: Thu, 30 Sep 2010 22:15:32 +0000 (-0700)
Subject: lib/list_sort: do not pass bad pointers to cmp callback
X-Git-Tag: v2.6.36-rc7~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f015ac3edd84ad72f88e08a4d83c56c360aae404;p=pandora-kernel.git

lib/list_sort: do not pass bad pointers to cmp callback

If the original list is a POT in length, the first callback from line 73
will pass a==b both pointing to the original list_head.  This is dangerous
because the 'list_sort()' user can use 'container_of()' and accesses the
"containing" object, which does not necessary exist for the list head.  So
the user can access RAM which does not belong to him.  If this is a write
access, we can end up with memory corruption.

Signed-off-by: Don Mullis <don.mullis@gmail.com>
Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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