From: Zhao Mengmeng <[email protected]> syzbot report a shift-out-of-bounds issue: ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/bcachefs/ec.c:147:2 shift exponent 108 is too large for 32-bit type 'unsigned int' ---- Here s.csum_granularity_bits = 108, shift is impossible for unsigned int, so modify the prt_printf() output to dump csum_granularity_bits rather than the actual value.
Reported-by: [email protected] Tested-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=f8c98a50c323635be65d Signed-off-by: Zhao Mengmeng <[email protected]> --- fs/bcachefs/ec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/bcachefs/ec.c b/fs/bcachefs/ec.c index 141a4c63142f..2d5cd9d837f2 100644 --- a/fs/bcachefs/ec.c +++ b/fs/bcachefs/ec.c @@ -144,7 +144,7 @@ void bch2_stripe_to_text(struct printbuf *out, struct bch_fs *c, nr_data, s.nr_redundant); bch2_prt_csum_type(out, s.csum_type); - prt_printf(out, " gran %u", 1U << s.csum_granularity_bits); + prt_printf(out, " gran 1<<%u", s.csum_granularity_bits); for (unsigned i = 0; i < s.nr_blocks; i++) { const struct bch_extent_ptr *ptr = sp->ptrs + i; -- 2.43.0
