[PATCH 5.13 792/800] erofs: fix error return code in erofs_read_superblock()

[Greg Kroah-Hartman]

From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>

commit 0508c1ad0f264a24c4643701823a45f6c9bd8146 upstream.

'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@xxxxxxxxxx
Fixes: b858a4844cfb ("erofs: support superblock checksum")
Cc: stable <stable@xxxxxxxxxxxxxxx> # 5.5+
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Reviewed-by: Gao Xiang <xiang@xxxxxxxxxx>
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Gao Xiang <xiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/erofs/super.c |    1 +
 1 file changed, 1 insertion(+)

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