[PATCH 3.12 084/206] xen-blkback: fix leak on grant map error path

[Jiri Slaby]

From: Roger Pau Monnà <roger.pau@xxxxxxxxxx>

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

===============

commit 61cecca865280bef4f8a9748d0a9afa5df351ac2 upstream.

Fix leaking a page when a grant mapping has failed.

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Reported-and-Tested-by: Tao Chen <boby.chen@xxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
 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 6620b73d0490..6beaaf83680e 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;
-- 
2.1.3

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