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bcachefs: Fix assert in bch2_alloc_v4_invalid()

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Reported-by: syzbot+10827fa6b176e1acf1d0@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-05-05 22:02:28 -04:00
parent 9a0ec04511
commit 6b8cbfc3db
2 changed files with 8 additions and 4 deletions
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4
fs/bcachefs/alloc_background.c
View File

@ -244,10 +244,10 @@ int bch2_alloc_v4_invalid(struct bch_fs *c, struct bkey_s_c k,
struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(k);
int ret = 0;
bkey_fsck_err_on(alloc_v4_u64s(a.v) > bkey_val_u64s(k.k), c, err,
bkey_fsck_err_on(alloc_v4_u64s_noerror(a.v) > bkey_val_u64s(k.k), c, err,
alloc_v4_val_size_bad,
"bad val size (%u > %zu)",
alloc_v4_u64s(a.v), bkey_val_u64s(k.k));
alloc_v4_u64s_noerror(a.v), bkey_val_u64s(k.k));
bkey_fsck_err_on(!BCH_ALLOC_V4_BACKPOINTERS_START(a.v) &&
BCH_ALLOC_V4_NR_BACKPOINTERS(a.v), c, err,

8
fs/bcachefs/alloc_background.h
View File

@ -126,13 +126,17 @@ static inline struct bpos alloc_freespace_pos(struct bpos pos, struct bch_alloc_
return pos;
}
static inline unsigned alloc_v4_u64s(const struct bch_alloc_v4 *a)
static inline unsigned alloc_v4_u64s_noerror(const struct bch_alloc_v4 *a)
{
unsigned ret = (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?:
return (BCH_ALLOC_V4_BACKPOINTERS_START(a) ?:
BCH_ALLOC_V4_U64s_V0) +
BCH_ALLOC_V4_NR_BACKPOINTERS(a) *
(sizeof(struct bch_backpointer) / sizeof(u64));
}
static inline unsigned alloc_v4_u64s(const struct bch_alloc_v4 *a)
{
unsigned ret = alloc_v4_u64s_noerror(a);
BUG_ON(ret > U8_MAX - BKEY_U64s);
return ret;
}