This is a note to let you know that I've just added the patch titled
xen/blkback: fix reference counting
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-blkback-fix-reference-counting.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ea5ec76d76da9279d12027c1828544c5ccbe7932 Mon Sep 17 00:00:00 2001
From: Vegard Nossum <[email protected]>
Date: Thu, 5 Sep 2013 13:00:14 +0200
Subject: xen/blkback: fix reference counting
From: Vegard Nossum <[email protected]>
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 <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Vegard Nossum <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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
@@ -887,6 +887,8 @@ 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;
@@ -899,7 +901,6 @@ 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;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.12/xen-blkback-fix-reference-counting.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
