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bcachefs: fix null-ptr-deref in have_stripes()

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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: syzbot+b468b9fef56949c3b528@syzkaller.appspotmail.com
Fixes: 7773df19c3 ("bcachefs: metadata version bucket_stripe_sectors")
Signed-off-by: Jeongjun Park <aha310510@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Jeongjun Park 2024-10-24 01:13:45 +09:00 committed by Kent Overstreet
parent 5c41f75d1b
commit a25a83de45
1 changed files with 3 additions and 0 deletions
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3
fs/bcachefs/sb-downgrade.c
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@ -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);
}