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Btrfs: avoid null deref in unpin_extent_cache()
[pandora-kernel.git]
/
fs
/
btrfs
/
extent_map.c
diff --git
a/fs/btrfs/extent_map.c
b/fs/btrfs/extent_map.c
index
2c726b7
..
ccbdcb5
100644
(file)
--- a/
fs/btrfs/extent_map.c
+++ b/
fs/btrfs/extent_map.c
@@
-208,7
+208,7
@@
int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len)
write_lock(&tree->lock);
em = lookup_extent_mapping(tree, start, len);
- WARN_ON(
em->start != start || !em
);
+ WARN_ON(
!em || em->start != start
);
if (!em)
goto out;