btrfs: fix log context list corruption after rename whiteout error

During a rename whiteout, if btrfs_whiteout_for_rename() returns an error
we can end up returning from btrfs_rename() with the log context object
still in the root's log context list - this happens if 'sync_log' was
set to true before we called btrfs_whiteout_for_rename() and it is
dangerous because we end up with a corrupt linked list (root->log_ctxs)
as the log context object was allocated on the stack.

After btrfs_rename() returns, any task that is running btrfs_sync_log()
concurrently can end up crashing because that linked list is traversed by
btrfs_sync_log() (through btrfs_remove_all_log_ctxs()). That results in
the same issue that commit e6c617102c7e4 ("Btrfs: fix log context list
corruption after rename exchange operation") fixed.

Fixes: d4682ba03ef618 ("Btrfs: sync log after logging new name")
CC: stable@vger.kernel.org # 4.19+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 27076eb..d267eb5 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -9496,6 +9496,10 @@ out_fail:
                ret = btrfs_sync_log(trans, BTRFS_I(old_inode)->root, &ctx);
                if (ret)
                        commit_transaction = true;
+       } else if (sync_log) {
+               mutex_lock(&root->log_mutex);
+               list_del(&ctx.list);
+               mutex_unlock(&root->log_mutex);
        }
        if (commit_transaction) {
                ret = btrfs_commit_transaction(trans);