[PATCH] block: fix possible int overflow

[Dmitry Frolov]

The sum "cluster_index + count" may overflow uint32_t.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Dmitry Frolov <fro...@swemel.ru>
---
 block/parallels.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index 9205a0864f..071b6dcaf8 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -184,11 +184,11 @@ static int mark_used(BlockDriverState *bs, unsigned long 
*bitmap,
     BDRVParallelsState *s = bs->opaque;
     uint32_t cluster_index = host_cluster_index(s, off);
     unsigned long next_used;
-    if (cluster_index + count > bitmap_size) {
+    if ((uint64_t)cluster_index + count > bitmap_size) {
         return -E2BIG;
     }
     next_used = find_next_bit(bitmap, bitmap_size, cluster_index);
-    if (next_used < cluster_index + count) {
+    if (next_used < (uint64_t)cluster_index + count) {
         return -EBUSY;
     }
     bitmap_set(bitmap, cluster_index, count);
-- 
2.43.0