diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 7ed1ff71a089..1be30487a2fa 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -1752,15 +1752,16 @@ static int btf_add_type(struct btf_verifier_env *env, struct btf_type *t)
 		/* Expand 'types' array */
 
 		struct btf_type **new_types;
-		u32 expand_by, new_size;
+		u32 expand_by, new_size, max_size;
 
-		if (btf->start_id + btf->types_size == BTF_MAX_TYPE) {
+		if (btf->start_id + btf->types_size >= BTF_MAX_TYPE) {
 			btf_verifier_log(env, "Exceeded max num of types");
 			return -E2BIG;
 		}
 
+		max_size = BTF_MAX_TYPE - btf->start_id;
 		expand_by = max_t(u32, btf->types_size >> 2, 16);
-		new_size = min_t(u32, BTF_MAX_TYPE,
+		new_size = min_t(u32, max_size,
 				 btf->types_size + expand_by);
 
 		new_types = kvzalloc_objs(*new_types, new_size,