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bcachefs: Fix a null ptr deref in btree_iter_traverse_one() 

When traversing nodes and we've reached the end of the btree, the
current btree node will be NULL.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-12-16 15:37:47 -05:00 committed by Kent Overstreet
parent ae2f17d5ad
commit b5a5c4c103
1 changed files with 2 additions and 1 deletions
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3
fs/bcachefs/btree_iter.c
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@ -1148,7 +1148,8 @@ static int btree_iter_traverse_one(struct btree_iter *iter)
iter->uptodate = BTREE_ITER_NEED_PEEK;
bch2_btree_trans_verify_locks(iter->trans);
__bch2_btree_iter_verify(iter, iter->l[iter->level].b);
if (btree_iter_node(iter, iter->level))
__bch2_btree_iter_verify(iter, iter->l[iter->level].b);
return 0;
}