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Message-Id: <1384011369-4381-1-git-send-email-felipensp@gmail.com> Date: Sat, 9 Nov 2013 13:36:09 -0200 From: Felipe Pena <felipensp@...il.com> To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, David Vrabel <david.vrabel@...rix.com> Cc: xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org, Felipe Pena <felipensp@...il.com> Subject: [PATCH] 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@...il.com> --- drivers/block/xen-blkfront.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index a4660bb..7bb1552 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1959,6 +1959,9 @@ static void blkif_release(struct gendisk *disk, fmode_t mode) bdev = bdget_disk(disk, 0); + if (!bdev) + goto out_mutex; + if (bdev->bd_openers) goto out; @@ -1989,6 +1992,7 @@ static void blkif_release(struct gendisk *disk, fmode_t mode) out: bdput(bdev); +out_mutex: mutex_unlock(&blkfront_mutex); } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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