Check X509Certificate::CreateFromHandle result.

net/cert/nss_cert_database.cc

Index: net/cert/nss_cert_database.cc
diff --git a/net/cert/nss_cert_database.cc b/net/cert/nss_cert_database.cc
index 4490daf5b53b58fbfc32909a5fe6b7b030bcd2cb..2b90e008f29df86f8ee2a46d08e6fb6f57c9ca39 100644
--- a/net/cert/nss_cert_database.cc
+++ b/net/cert/nss_cert_database.cc
@@ -420,8 +420,13 @@ void NSSCertDatabase::ListCertsImpl(crypto::ScopedPK11Slot slot,
   CERTCertListNode* node;
   for (node = CERT_LIST_HEAD(cert_list); !CERT_LIST_END(node, cert_list);
        node = CERT_LIST_NEXT(node)) {
-    certs->push_back(X509Certificate::CreateFromHandle(
-        node->cert, X509Certificate::OSCertHandles()));
+    scoped_refptr<X509Certificate> cert = X509Certificate::CreateFromHandle(
+        node->cert, X509Certificate::OSCertHandles());
+    if (!cert) {
+      LOG(ERROR) << "X509Certificate::CreateFromHandle failed";
+      continue;
+    }
+    certs->push_back(cert);
   }
   CERT_DestroyCertList(cert_list);
 }