From: Jeff Dike <jdike@addtoit.com>
Date: Mon, 16 Jul 2007 06:38:47 +0000 (-0700)
Subject: uml: fix request->sector update
X-Git-Tag: v2.6.23-rc1~989
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a6d3a2a3813e7b25267366cfbf9a4a4698dd1c2;p=pandora-kernel.git

uml: fix request->sector update

It is theoretically possible for a request to finish and be freed between
writing it to the I/O thread and updating the sector count.  In this case, the
update will dereference a freed pointer.

To avoid this, I delay the update until processing the next sg segment, when
the request pointer is known to be good.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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