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bcachefs: fix shift oob in alloc_lru_idx_fragmentation

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The size of a.data_type is set abnormally large, causing shift-out-of-bounds.
To fix this, we need to add validation on a.data_type in
alloc_lru_idx_fragmentation().

Reported-by: syzbot+7f45fa9805c40db3f108@syzkaller.appspotmail.com
Fixes: 260af1562e ("bcachefs: Kill alloc_v4.fragmentation_lru")
Signed-off-by: Jeongjun Park <aha310510@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Jeongjun Park 2024-10-22 00:43:56 +09:00 committed by Kent Overstreet
parent 2045fc4295
commit 5c41f75d1b
1 changed files with 3 additions and 0 deletions
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3
fs/bcachefs/alloc_background.h
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@ -168,6 +168,9 @@ static inline bool data_type_movable(enum bch_data_type type)
static inline u64 alloc_lru_idx_fragmentation(struct bch_alloc_v4 a,
struct bch_dev *ca)
{
if (a.data_type >= BCH_DATA_NR)
return 0;
if (!data_type_movable(a.data_type) ||
!bch2_bucket_sectors_fragmented(ca, a))
return 0;