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Commit 4eb3991c authored by Dan Carpenter's avatar Dan Carpenter Committed by Chris Mason
Browse files

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: default avatarDan Carpenter <error27@gmail.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent df66916e

fs/btrfs/extent_map.c

+1 −1
Original line number Diff line number Diff line
@@ -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;