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

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

From: Chris Mason <[email protected]>

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 <[email protected]>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <[email protected]>
---
 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 fe443fece851..6c80e0801e58 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1654,6 +1654,7 @@ 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;
-- 
1.9.1

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