diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 17caf4ea67da..4eaf7ed0d1f4 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -550,7 +550,7 @@ static void *kmalloc_reserve(unsigned int *size, gfp_t flags, int node,
 			     bool *pfmemalloc)
 {
 	bool ret_pfmemalloc = false;
-	unsigned int obj_size;
+	size_t obj_size;
 	void *obj;
 
 	obj_size = SKB_HEAD_ALIGN(*size);
@@ -567,7 +567,13 @@ static void *kmalloc_reserve(unsigned int *size, gfp_t flags, int node,
 		obj = kmem_cache_alloc_node(skb_small_head_cache, flags, node);
 		goto out;
 	}
-	*size = obj_size = kmalloc_size_roundup(obj_size);
+
+	obj_size = kmalloc_size_roundup(obj_size);
+	/* The following cast might truncate high-order bits of obj_size, this
+	 * is harmless because kmalloc(obj_size >= 2^32) will fail anyway.
+	 */
+	*size = (unsigned int)obj_size;
+
 	/*
 	 * Try a regular allocation, when that fails and we're not entitled
 	 * to the reserves, fail.