c->btree_roots_known[i].b can be NULL. In this case, a NULL pointer dereference occurs, so you need to add code to check the variable.
Reported-by: [email protected] Fixes: 7773df19c35f ("bcachefs: metadata version bucket_stripe_sectors") Signed-off-by: Jeongjun Park <[email protected]> --- fs/bcachefs/sb-downgrade.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/bcachefs/sb-downgrade.c b/fs/bcachefs/sb-downgrade.c index ae715ff658e8..8767c33c2b51 100644 --- a/fs/bcachefs/sb-downgrade.c +++ b/fs/bcachefs/sb-downgrade.c @@ -143,6 +143,9 @@ UPGRADE_TABLE() static int have_stripes(struct bch_fs *c) { + if (IS_ERR_OR_NULL(c->btree_roots_known[BTREE_ID_stripes].b)) + return 0; + return !btree_node_fake(c->btree_roots_known[BTREE_ID_stripes].b); } --
