diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index dc554faff22a..cea8290ac0b9 100644
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -130,7 +130,11 @@ void *malloc(size_t len)
 {
 	struct nolibc_heap *heap;
 
-	len  = sizeof(*heap) + len;
+	if (__builtin_expect(__builtin_add_overflow(len, sizeof(*heap), &len), 0)) {
+		SET_ERRNO(ENOMEM);
+		return NULL;
+	}
+
 	heap = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE,
 		    -1, 0);
 	if (__builtin_expect(heap == MAP_FAILED, 0))