linux-kernel - [PATCH 3.12 163/181] Btrfs: fix double free in find_lock_delalloc

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Message-Id: <96d0e46aab556dbdb727634ea4289bd16fd757c9.1404128998.git.jslaby@suse.cz>
Date:	Mon, 30 Jun 2014 13:53:04 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Chris Mason <clm@...com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 163/181] Btrfs: fix double free in find_lock_delalloc_range

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

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

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

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: Jiri Slaby <jslaby@...e.cz>
---
 fs/btrfs/extent_io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 51731b76900d..0d611d1e2e34 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1645,6 +1645,7 @@ again:
 		 * shortening the size of the delalloc range we're searching
 		 */
 		free_extent_state(cached_state);
+		cached_state = NULL;
 		if (!loops) {
 			max_bytes = PAGE_CACHE_SIZE;
 			loops = 1;
-- 
2.0.0

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