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authorDan Carpenter <error27@gmail.com>2009-11-10 09:01:43 +0000
committerChris Mason <chris.mason@oracle.com>2009-11-11 14:20:18 -0500
commit4eb3991c5def39bcf553c14ebe2618fcb47b627f (patch)
tree9c35f532bd29e68014cc16dc6e528a8cca5cfe34 /fs/btrfs/extent_map.c
parentdf66916e71231e9f2377cac9c5c1e2d190f9a427 (diff)
Btrfs: avoid null deref in unpin_extent_cache()
I re-orderred the checks to avoid dereferencing "em" if it was null. Found by smatch static checker. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_map.c')
-rw-r--r--fs/btrfs/extent_map.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 2c726b7b9fa..ccbdcb54ec5 100644
--- 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;