[PATCH 2/2] image-sparse: change chunk_data_sz to u64

[Steffen Trumtrar]

chunk_data_sz is set to the result of a __le32 * __le32 multiplication:

  chunk_data_sz = si->sparse.blk_sz * si->chunk.chunk_sz;

This will overflow.

Signed-off-by: Steffen Trumtrar <s.trumtrar at pengutronix.de>
---
 lib/image-sparse.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/image-sparse.c b/lib/image-sparse.c
index 8e7a52fd71..c375c78d63 100644
--- a/lib/image-sparse.c
+++ b/lib/image-sparse.c
@@ -62,7 +62,8 @@ struct sparse_image_ctx {
 
 static int sparse_seek(struct sparse_image_ctx *si)
 {
-	unsigned int chunk_data_sz, payload;
+	uint64_t chunk_data_sz;
+	unsigned int payload;
 	loff_t offs;
 	int ret;
 
@@ -94,7 +95,7 @@ again:
 			return -errno;
 	}
 
-	chunk_data_sz = si->sparse.blk_sz * si->chunk.chunk_sz;
+	chunk_data_sz = (uint64_t) si->sparse.blk_sz * si->chunk.chunk_sz;
 	payload = si->chunk.total_sz - si->sparse.chunk_hdr_sz;
 
 	si->processed_chunks++;
-- 
2.20.1