From: Petr Uzel <petr.uzel@suse.cz>
Date: Fri, 21 Oct 2011 11:31:09 +0000 (+0200)
Subject: [SCSI] st: fix race in st_scsi_execute_end
X-Git-Tag: v3.2-rc1~44^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c68bf8eeaa57c852e74adcf597237be149eef830;p=pandora-kernel.git

[SCSI] st: fix race in st_scsi_execute_end

The call to complete() in st_scsi_execute_end() wakes up sleeping thread
in write_behind_check(), which frees the st_request, thus invalidating
the pointer to the associated bio structure, which is then passed to the
blk_rq_unmap_user(). Fix by storing pointer to bio structure into
temporary local variable.

This bug is present since at least linux-2.6.32.

CC: stable@kernel.org
Signed-off-by: Petr Uzel <petr.uzel@suse.cz>
Reported-by: Juergen Groß <juergen.gross@ts.fujitsu.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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