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| author | Dan Carpenter <error27@gmail.com> | 2009-11-10 09:01:43 +0000 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-11-11 14:20:18 -0500 |
| commit | 4eb3991c5def39bcf553c14ebe2618fcb47b627f (patch) | |
| tree | 9c35f532bd29e68014cc16dc6e528a8cca5cfe34 | |
| parent | df66916e71231e9f2377cac9c5c1e2d190f9a427 (diff) | |
| download | linux-3.10-4eb3991c5def39bcf553c14ebe2618fcb47b627f.tar.gz linux-3.10-4eb3991c5def39bcf553c14ebe2618fcb47b627f.tar.bz2 linux-3.10-4eb3991c5def39bcf553c14ebe2618fcb47b627f.zip | |
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>
| -rw-r--r-- | fs/btrfs/extent_map.c | 2 |
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; |