Before determining that the goal length is a multiple of the stripe size,
check CR_GOAL_LEN_FAST and CR_BEST_AVAIL_LEN first.
Fixes: 1f6bc02f1848 ("ext4: fallback to complex scan if aligned scan doesn't work")
Reported-by: syzbot+1ad8bac5af24d01e2cbd@xxxxxxxxxxxxxxxxxxxxxxxxx
#syz test: upstream ee9a43b7cfe2
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 9dda9cd68ab2..451f92cde461 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2928,13 +2928,12 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
if (cr == CR_POWER2_ALIGNED)
ext4_mb_simple_scan_group(ac, &e4b);
else {
- bool is_stripe_aligned = sbi->s_stripe &&
+ bool is_stripe_aligned = (cr == CR_GOAL_LEN_FAST ||
+ cr == CR_BEST_AVAIL_LEN) && sbi->s_stripe &&
!(ac->ac_g_ex.fe_len %
EXT4_B2C(sbi, sbi->s_stripe));
- if ((cr == CR_GOAL_LEN_FAST ||
- cr == CR_BEST_AVAIL_LEN) &&
- is_stripe_aligned)
+ if (is_stripe_aligned)
ext4_mb_scan_aligned(ac, &e4b);
if (ac->ac_status == AC_STATUS_CONTINUE)
