linux-kernel - [PATCH 3.2 071/125] Btrfs: fix double free in find_lock_delalloc

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Message-ID: <lsq.1404846110.166011291@decadent.org.uk>
Date:	Tue, 08 Jul 2014 20:01:50 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Chris Mason" <clm@...com>
Subject: [PATCH 3.2 071/125] Btrfs: fix double free in find_lock_delalloc_range

3.2.61-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Chris Mason <clm@...com>

commit 7d78874273463a784759916fc3e0b4e2eb141c70 upstream.

We need to NULL the cached_state after freeing it, otherwise
we might free it again if find_delalloc_range doesn't find anything.

Signed-off-by: Chris Mason <clm@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/btrfs/extent_io.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1523,6 +1523,7 @@ again:
 		 * shortening the size of the delalloc range we're searching
 		 */
 		free_extent_state(cached_state);
+		cached_state = NULL;
 		if (!loops) {
 			unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1);
 			max_bytes = PAGE_CACHE_SIZE - offset;

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