add in null checks on key material

Author: jakemas

crypto/fipsmodule/kem/kem.c

@@ -331,6 +331,12 @@ int KEM_KEY_set_raw_keypair_from_seed(KEM_KEY *key, const CBS *seed) {
   uint8_t *public_key = OPENSSL_malloc(key->kem->public_key_len);
   uint8_t *secret_key = OPENSSL_malloc(key->kem->secret_key_len);
 
+  if (public_key == NULL || secret_key == NULL) {
+    OPENSSL_free(public_key);
+    OPENSSL_free(secret_key);
+    OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
+    return 0;
+ }
   size_t public_len = key->kem->public_key_len;
   size_t secret_len = key->kem->secret_key_len;