[PATCH 5.15 163/402] ext4: fix unit mismatch in ext4_mb_new_blocks_simple

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>

[ Upstream commit 497885f72d930305d8e61b6b616b22b4da1adf90 ]

The "i" returned from mb_find_next_zero_bit is in cluster unit and we
need offset "block" corresponding to "i" in block unit. Convert "i" to
block unit to fix the unit mismatch.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230603150327.3596033-3-shikemeng@xxxxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Stable-dep-of: 3f4830abd236 ("ext4: fix potential unnitialized variable")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/ext4/mballoc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index c2fcdee223317..383703e20ea36 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -5886,6 +5886,7 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
 {
 	struct buffer_head *bitmap_bh;
 	struct super_block *sb = ar->inode->i_sb;
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	ext4_group_t group;
 	ext4_grpblk_t blkoff;
 	ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
@@ -5914,7 +5915,8 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
 			if (i >= max)
 				break;
 			if (ext4_fc_replay_check_excluded(sb,
-				ext4_group_first_block_no(sb, group) + i)) {
+				ext4_group_first_block_no(sb, group) +
+				EXT4_C2B(sbi, i))) {
 				blkoff = i + 1;
 			} else
 				break;
@@ -5931,7 +5933,7 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
 		return 0;
 	}
 
-	block = ext4_group_first_block_no(sb, group) + i;
+	block = ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, i);
 	ext4_mb_mark_bb(sb, block, 1, 1);
 	ar->len = 1;
 
-- 
2.43.0







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