bcachefs: Fix a null ptr deref

bch2_btree_iter_peek() won't always return a key - whoops.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

diff --git a/fs/bcachefs/move.c b/fs/bcachefs/move.c
index bce10eb4eb4c6a080765478d44360b578866e33a..8807b18ddc433a1059de43873377752c8bb46bfb 100644 (file)
--- a/fs/bcachefs/move.c
+++ b/fs/bcachefs/move.c
@@ -522,6 +522,11 @@ static int lookup_inode(struct btree_trans *trans, struct bpos pos,
        if (ret)
                goto err;
 
+       if (!k.k || bkey_cmp(k.k->p, pos)) {
+               ret = -ENOENT;
+               goto err;
+       }
+
        ret = k.k->type == KEY_TYPE_inode ? 0 : -EIO;
        if (ret)
                goto err;