diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1a5072425c4a..408bc743a141 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2383,6 +2383,8 @@ static int create_cache_policy(struct cache *cache, struct cache_args *ca,
 static bool too_many_discard_blocks(sector_t discard_block_size,
 				    sector_t origin_size)
 {
+	if (discard_block_size > U32 / 2)
+		return false;
 	(void) sector_div(origin_size, discard_block_size);
 
 	return origin_size > MAX_DISCARD_BLOCKS;