[3.13.y.z extended stable] Patch "xen-blkback: fix leak on grant map error path" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Oct 21 20:09:27 UTC 2014

This is a note to let you know that I have just added a patch titled

    xen-blkback: fix leak on grant map error path

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:


This patch is scheduled to be released in version

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see



>From 03d4a557436fabdc80bde45040d310ad3d90d23b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= <roger.pau at citrix.com>
Date: Mon, 15 Sep 2014 11:55:27 +0200
Subject: xen-blkback: fix leak on grant map error path
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit 61cecca865280bef4f8a9748d0a9afa5df351ac2 upstream.

Fix leaking a page when a grant mapping has failed.

Signed-off-by: Roger Pau Monné <roger.pau at citrix.com>
Reported-and-Tested-by: Tao Chen <boby.chen at huawei.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/block/xen-blkback/blkback.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 6620b73..6beaaf8 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -755,6 +755,7 @@ again:
 			BUG_ON(new_map_idx >= segs_to_map);
 			if (unlikely(map[new_map_idx].status != 0)) {
 				pr_debug(DRV_PFX "invalid buffer -- could not remap it\n");
+				put_free_pages(blkif, &pages[seg_idx]->page, 1);
 				pages[seg_idx]->handle = BLKBACK_INVALID_HANDLE;
 				ret |= 1;
 				goto next;

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