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bcachefs: Fix a null ptr deref in bch2_btree_iter_traverse_one()

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We use sentinal values that aren't NULL to indicate there's a btree node
at a higher level; occasionally, this may result in
btree_iter_up_until_good_node() stopping at one of those sentinal
values.

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 2020-06-26 13:56:21 -04:00 committed by Kent Overstreet
parent 649a9b68ac
commit c61b7e21ec
1 changed files with 1 additions and 1 deletions
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2
fs/bcachefs/btree_iter.c
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@ -1235,7 +1235,7 @@ static int btree_iter_traverse_one(struct btree_iter *iter)
*
* XXX correctly using BTREE_ITER_UPTODATE should make this unnecessary
*/
if (btree_iter_node(iter, iter->level)) {
if (is_btree_node(iter, iter->level)) {
BUG_ON(!btree_iter_pos_in_node(iter, iter->l[iter->level].b));
btree_iter_advance_to_pos(iter, &iter->l[iter->level], -1);