From: Jens Axboe <jaxboe@fusionio.com>
Date: Sat, 23 Oct 2010 18:40:26 +0000 (+0200)
Subject: block: fix use-after-free bug in blk throttle code
X-Git-Tag: v2.6.37-rc1~146^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ad58c028652753814054f4e3ac58f925e7343f4;p=pandora-kernel.git

block: fix use-after-free bug in blk throttle code

blk_throtl_exit() frees the throttle data hanging off the queue
in blk_cleanup_queue(), but blk_put_queue() will indirectly
dereference this data when calling blk_sync_queue() which in
turns calls throtl_shutdown_timer_wq().

Fix this by moving the freeing of the throttle data to when
the queue is truly being released, and post the call to
blk_sync_queue().

Reported-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

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