From: Felipe Pena <felipensp@gmail.com>
Date: Sat, 9 Nov 2013 15:36:09 +0000 (-0200)
Subject: block: xen-blkfront: Fix possible NULL ptr dereference
X-Git-Tag: v3.13-rc3~8^2~2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f089cb89d2f47702c31bd584c12badc88bbe17c;p=pandora-kernel.git

block: xen-blkfront: Fix possible NULL ptr dereference

In the blkif_release function the bdget_disk() call might returns
a NULL ptr which might be dereferenced on bdev->bd_openers checking

Signed-off-by: Felipe Pena <felipensp@gmail.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
[v2: Added WARN per Roger's suggestion]
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