Btrfs: Fix extent_map leak in extent_bmap

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index c44989a1e520..e4ee980cc138 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -1924,6 +1924,7 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
         struct inode *inode = mapping->host;
         u64 start = iblock << inode->i_blkbits;
         u64 end = start + (1 << inode->i_blkbits) - 1;
+        sector_t sector = 0;
         struct extent_map *em;
 
         em = get_extent(inode, NULL, 0, start, end, 0);
@@ -1932,9 +1933,12 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
 
         if (em->block_start == EXTENT_MAP_INLINE ||
             em->block_start == EXTENT_MAP_HOLE)
-                return 0;
+                goto out;
 
-        return (em->block_start + start - em->start) >> inode->i_blkbits;
+        sector = (em->block_start + start - em->start) >> inode->i_blkbits;
+out:
+        free_extent_map(em);
+        return sector;
 }
 
 static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb)