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| author | Liu Bo <bo.li.liu@oracle.com> | 2012-10-25 07:30:19 -0600 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2012-10-25 15:55:21 -0400 |
| commit | 7bfdcf7fbad56c0f1fc3e2d26431bed72bdcce2d (patch) | |
| tree | 7f424418288996ca3f8eae052d703e9699b1e23a /fs/btrfs/ctree.c | |
| parent | c657c3ef1adb2585ed7d2a6db73d0002926a6726 (diff) | |
| download | lwn-7bfdcf7fbad56c0f1fc3e2d26431bed72bdcce2d.tar.gz lwn-7bfdcf7fbad56c0f1fc3e2d26431bed72bdcce2d.zip | |
Btrfs: fix memory leak when cloning root's node
After cloning root's node, we forgot to dec the src's ref
which can lead to a memory leak.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index eba44b076829..cdfb4c49a806 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -1241,6 +1241,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq) { struct tree_mod_elem *tm; struct extent_buffer *eb; + struct extent_buffer *old; struct tree_mod_root *old_root = NULL; u64 old_generation = 0; u64 logical; @@ -1264,13 +1265,14 @@ get_old_root(struct btrfs_root *root, u64 time_seq) btrfs_tree_read_unlock(root->node); free_extent_buffer(root->node); blocksize = btrfs_level_size(root, old_root->level); - eb = read_tree_block(root, logical, blocksize, 0); - if (!eb) { + old = read_tree_block(root, logical, blocksize, 0); + if (!old) { pr_warn("btrfs: failed to read tree block %llu from get_old_root\n", logical); WARN_ON(1); } else { - eb = btrfs_clone_extent_buffer(eb); + eb = btrfs_clone_extent_buffer(old); + free_extent_buffer(old); } } else if (old_root) { btrfs_tree_read_unlock(root->node); |