Btrfs: fix double free in find_lock_delalloc_range

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@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index e7e7afb4a87268211e8b0ef881a6eeac0068eefd..82de090909355c28364e524fe87ec5509d07ebde 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1624,6 +1624,7 @@ 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;