fat: fix fat_ent_write() for reverting the value

commit 64d9183203ee ("fat: restore original value when fat_ent_write
failed") try to revert the fatent value to old value when got the error on
mirror FAT.

However it didn't work if the error is when writing the fatent bh.  In
that case, the bh is cleared the uptodate flag, so reuse bh is invalid.

Fix this by reverting the fatent only if got the error on mirror FAT.

Link: https://lore.kernel.org/87ik4yz9fv.fsf_-_@mail.parknet.co.jp
Fixes: 64d9183203ee ("fat: restore original value when fat_ent_write failed")
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Reported-by: syzbot+e64c6472a3d96a75172a@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=e64c6472a3d96a75172a
Reported-by: syzbot+26461e903494e689c24f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=26461e903494e689c24f
Cc: Yemu Lu <prcups@krgm.moe>
Cc: Ren Wei <n05ec@lzu.edu.cn>
Cc: Yuan Tan <yuantan098@gmail.com>
Cc: Yifan Wu <yifanwucs@gmail.com>
Cc: Juefei Pu <tomapufckgml@gmail.com>
Cc: Xin Liu <bird@lzu.edu.cn>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions