erofs: fix error return code in erofs_read_superblock()

'ret' will be overwritten to 0 if erofs_sb_has_sb_chksum() return true,
thus 0 will return in some error handling cases. Fix to return negative
error code -EINVAL instead of 0.

Link: https://lore.kernel.org/r/20210519141657.3062715-1-weiyongjun1@huawei.com
Fixes: b858a4844cfb ("erofs: support superblock checksum")
Cc: stable <stable@vger.kernel.org> # 5.5+
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Gao Xiang <xiang@kernel.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <xiang@kernel.org>

diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index bbf3bbd908e0816e4d4d894a69431c58f0c95b3f..22991d22af5a2d92e6455a104763925b58256600 100644 (file)
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -285,6 +285,7 @@ static int erofs_read_superblock(struct super_block *sb)
                        goto out;
        }
 
+       ret = -EINVAL;
        blkszbits = dsb->blkszbits;
        /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
        if (blkszbits != LOG_BLOCK_SIZE) {