From: Tejun Heo <tj@kernel.org>
Date: Mon, 1 Nov 2010 10:39:19 +0000 (+0100)
Subject: libata: fix NULL sdev dereference race in atapi_qc_complete()
X-Git-Tag: v2.6.27.57~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=330b3db2ccf393581e2c06d2cb36e0689dd585e3;p=pandora-kernel.git

libata: fix NULL sdev dereference race in atapi_qc_complete()

commit 2a5f07b5ec098edc69e05fdd2f35d3fbb1235723 upstream.

SCSI commands may be issued between __scsi_add_device() and dev->sdev
assignment, so it's unsafe for ata_qc_complete() to dereference
dev->sdev->locked without checking whether it's NULL or not.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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