[PATCH] erofs: explicit cast blkaddr to u64 before shift operation

[Jia Zhu]

We should explicitly cast @blkaddr from u32 to u64 before the shift
operation to return the larger type.

Fixes: b1c2d99b18ff ("erofs: avoid hardcoded blocksize for subpage block support")
Signed-off-by: Jia Zhu <zhujia.zj@xxxxxxxxxxxxx>
---
 fs/erofs/data.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index aa7f9e4f86fb..6fe9a779fa91 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -35,7 +35,7 @@ void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
 		  enum erofs_kmap_type type)
 {
 	struct inode *inode = buf->inode;
-	erofs_off_t offset = blkaddr << inode->i_blkbits;
+	erofs_off_t offset = (erofs_off_t)blkaddr << inode->i_blkbits;
 	pgoff_t index = offset >> PAGE_SHIFT;
 	struct page *page = buf->page;
 	struct folio *folio;
-- 
2.20.1