From 15cdfb974a67d11425090980e727746f8a351078 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Sun, 17 Nov 2019 19:30:53 +0300
Subject: [PATCH] Ignore invalid UTF-8 hashtags from broken database.

GitOrigin-RevId: 085b83bd70c13d5b4f4d846ca0dba6e9c23b59a7
---
 td/telegram/HashtagHints.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/td/telegram/HashtagHints.cpp b/td/telegram/HashtagHints.cpp
index 3880e95c9..d2eccd076 100644
--- a/td/telegram/HashtagHints.cpp
+++ b/td/telegram/HashtagHints.cpp
@@ -13,6 +13,7 @@
 
 #include "td/utils/logging.h"
 #include "td/utils/tl_helpers.h"
+#include "td/utils/utf8.h"
 
 #include <functional>
 
@@ -73,6 +74,11 @@ string HashtagHints::get_key() const {
 }
 
 void HashtagHints::hashtag_used_impl(const string &hashtag) {
+  if (!check_utf8(hashtag)) {
+    LOG(ERROR) << "Trying to add invalid UTF-8 hashtag \"" << hashtag << '"';
+    return;
+  }
+
   // TODO: may be it should be optimized a little
   auto key = std::hash<std::string>()(hashtag);
   hints_.add(key, hashtag);
@@ -87,7 +93,7 @@ void HashtagHints::from_db(Result<string> data, bool dummy) {
   std::vector<string> hashtags;
   auto status = unserialize(hashtags, data.ok());
   if (status.is_error()) {
-    LOG(ERROR) << status;
+    LOG(ERROR) << "Failed to unserialize hashtag hints: " << status;
     return;
   }