[PATCH 5.15.y] f2fs: fix to update superblock crc in sanity_check_area_boundary()

[Sasha Levin <sashal@kernel.org>]

From: Chao Yu <chao@kernel.org>

[ Upstream commit f8f956c7ec8c0285d7a80bed497d2f7adcbded15 ]

This patch fixes the bug reported by Sashiko:

We should update superblock crc along w/ raw_super->segment_count in
sanity_check_area_boundary() if sb_checksum feature is enabled.

Cc: stable@kernel.org
Fixes: d440c52d3151 ("f2fs: support superblock checksum")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[ sashal: Added sbi as the first argument to f2fs_crc32() to match the three-argument API. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/super.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 405e17984adef..7ee17b5521742 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3268,6 +3268,12 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
 		/* fix in-memory information all the time */
 		raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
 				segment0_blkaddr) >> log_blocks_per_seg);
+		if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_SB_CHKSUM)) {
+			__u32 crc = f2fs_crc32(sbi, raw_super,
+					offsetof(struct f2fs_super_block, crc));
+
+			raw_super->crc = cpu_to_le32(crc);
+		}
 
 		if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
 			set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
-- 
2.53.0