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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>
This commit is contained in:
Dan Carpenter 2009-11-10 09:01:43 +00:00 committed by Chris Mason
parent df66916e71
commit 4eb3991c5d
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent_map.c
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@ -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;