From: Filipe Manana fdmanana@suse.com

[ Upstream commit ede600e497b1461d06d22a7d17703d9096868bc3 ]

At split_node(), if we fail to log the tree mod log copy operation, we return without unlocking the split extent buffer we just allocated and without decrementing the reference we own on it. Fix this by unlocking it and decrementing the ref count before returning.

Fixes: 5de865eebb83 ("Btrfs: fix tree mod logging") CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Qu Wenruo wqu@suse.com 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: Sasha Levin sashal@kernel.org --- fs/btrfs/ctree.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 156716f9e3e21..61ed69c688d58 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -3537,6 +3537,8 @@ static noinline int split_node(struct btrfs_trans_handle *trans,

ret = tree_mod_log_eb_copy(fs_info, split, c, 0, mid, c_nritems - mid); if (ret) { + btrfs_tree_unlock(split); + free_extent_buffer(split); btrfs_abort_transaction(trans, ret); return ret; }