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| author | Filipe Manana <fdmanana@suse.com> | 2021-02-04 17:35:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-03 20:22:53 +0300 |
| commit | 335241c0d985666b25761cb98c1468613af67117 (patch) | |
| tree | 69d80f1f9677f878ca751d1c5938cdf75a6012ac /fs/btrfs | |
| parent | 605689701f3b347f45baedec65162c2f778a4eb7 (diff) | |
| download | linux-335241c0d985666b25761cb98c1468613af67117.tar.xz | |
btrfs: fix extent buffer leak on failure to copy root
commit 72c9925f87c8b74f36f8e75a4cd93d964538d3ca upstream.
At btrfs_copy_root(), if the call to btrfs_inc_ref() fails we end up
returning without unlocking and releasing our reference on the extent
buffer named "cow" we previously allocated with btrfs_alloc_tree_block().
So fix that by unlocking the extent buffer and dropping our reference on
it before returning.
Fixes: be20aa9dbadc8c ("Btrfs: Add mount option to turn off data cow")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/ctree.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 127217c25726..5178065e39f3 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -283,6 +283,8 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans, else ret = btrfs_inc_ref(trans, root, cow, 0); if (ret) { + btrfs_tree_unlock(cow); + free_extent_buffer(cow); btrfs_abort_transaction(trans, ret); return ret; } |