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bcachefs: Check for subvolues with bogus snapshot/inode fields

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This fixes an assertion pop in btree_iter.c that checks for forgetting
to pass a snapshot ID when iterating over snapshots btrees.

Reported-by: syzbot+0dfe05235e38653e2aee@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-05-20 01:11:20 -04:00
parent 6b74fdcc8e
commit 765b8cb8ac
2 changed files with 12 additions and 1 deletions
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4
fs/bcachefs/sb-errors_types.h
View file

@ -273,7 +273,9 @@
x(dup_backpointer_to_bad_csum_extent, 265) \
x(btree_bitmap_not_marked, 266) \
x(sb_clean_entry_overrun, 267) \
x(btree_ptr_v2_written_0, 268)
x(btree_ptr_v2_written_0, 268) \
x(subvol_snapshot_bad, 269) \
x(subvol_inode_bad, 270)
enum bch_sb_error_id {
#define x(t, n) BCH_FSCK_ERR_##t = n,

9
fs/bcachefs/subvolume.c
View file

@ -210,12 +210,21 @@ int bch2_check_subvol_children(struct bch_fs *c)
int bch2_subvolume_invalid(struct bch_fs *c, struct bkey_s_c k,
enum bch_validate_flags flags, struct printbuf *err)
{
struct bkey_s_c_subvolume subvol = bkey_s_c_to_subvolume(k);
int ret = 0;
bkey_fsck_err_on(bkey_lt(k.k->p, SUBVOL_POS_MIN) ||
bkey_gt(k.k->p, SUBVOL_POS_MAX), c, err,
subvol_pos_bad,
"invalid pos");
bkey_fsck_err_on(!subvol.v->snapshot, c, err,
subvol_snapshot_bad,
"invalid snapshot");
bkey_fsck_err_on(!subvol.v->inode, c, err,
subvol_inode_bad,
"invalid inode");
fsck_err:
return ret;
}