linux-kernel - [PATCH 3.4 26/60] xen/blkback: fix reference counting

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Message-Id: <20131202190335.958917242@linuxfoundation.org>
Date:	Mon,  2 Dec 2013 11:06:07 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jan Beulich <JBeulich@...e.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Vegard Nossum <vegard.nossum@...cle.com>,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 3.4 26/60] xen/blkback: fix reference counting

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vegard Nossum <vegard.nossum@...cle.com>

commit ea5ec76d76da9279d12027c1828544c5ccbe7932 upstream.

If the permission check fails, we drop a reference to the blkif without
having taken it in the first place. The bug was introduced in commit
604c499cbbcc3d5fe5fb8d53306aa0fae1990109 (xen/blkback: Check device
permissions before allowing OP_DISCARD).

Cc: Jan Beulich <JBeulich@...e.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/xen-blkback/blkback.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -401,6 +401,8 @@ static int dispatch_discard_io(struct xe
 	unsigned long secure;
 	struct phys_req preq;
 
+	xen_blkif_get(blkif);
+
 	preq.sector_number = req->u.discard.sector_number;
 	preq.nr_sects      = req->u.discard.nr_sectors;
 
@@ -413,7 +415,6 @@ static int dispatch_discard_io(struct xe
 	}
 	blkif->st_ds_req++;
 
-	xen_blkif_get(blkif);
 	secure = (blkif->vbd.discard_secure &&
 		 (req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
 		 BLKDEV_DISCARD_SECURE : 0;


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