From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 6 Nov 2010 00:45:59 +0000 (-0700)
Subject: floppy: fix use-after-free in module load failure path
X-Git-Tag: v2.6.37-rc2~83
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c093ee4f07f46d3a835841cafa07514fa94878d2;p=pandora-kernel.git

floppy: fix use-after-free in module load failure path

Commit 488211844e0c ("floppy: switch to one queue per drive instead of
sharing a queue") introduced a use-after-free.  We do "put_disk()" on
the disk device _before_ we then clean up the queue associated with that
disk.

Move the put_disk() down to avoid dereferencing a free'd data structure.

Cc: Jens Axboe <jaxboe@fusionio.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Reported-and-tested-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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