The bkey_val_bytes() gets the number of bytes of value stored in bkey->u64s.If u64s is smaller than BKEY_U64s, it causes a negative number to be converted to an unsigned number.
Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=1a11884d9c9f1353942d Fixes: ba81523eaac3 ("bcachefs: Split out bkey_types.h") Link: https://lore.kernel.org/all/[email protected]/T/ Signed-off-by: zhanghao <[email protected]> --- fs/bcachefs/bkey_types.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/bcachefs/bkey_types.h b/fs/bcachefs/bkey_types.h index c9ae9e42b385..60fa5af93032 100644 --- a/fs/bcachefs/bkey_types.h +++ b/fs/bcachefs/bkey_types.h @@ -21,6 +21,8 @@ static inline struct bkey_i *bkey_next(struct bkey_i *k) static inline size_t bkey_val_bytes(const struct bkey *k) { + if (k->u64s < BKEY_U64s) + return 0; return bkey_val_u64s(k) * sizeof(u64); } base-commit: d74da846046aeec9333e802f5918bd3261fb5509 prerequisite-patch-id: 1ec511753fc7aab35ba0e982013cf91ba4403da6 -- 2.39.2
