From 05b279bb132393aafda8782df070af01aba7c82c Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Fri, 22 May 2020 18:07:04 +0300
Subject: [PATCH] Never trust peers sticker set name in secret chats.

GitOrigin-RevId: 11f6534963920bd7c736a9cb3dcf3c73e2e68e6c
---
 td/telegram/StickersManager.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index 7ec8291c..30c26728 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -1868,7 +1868,9 @@ StickerSetId StickersManager::on_get_input_sticker_set(FileId sticker_file_id,
               }
             }));
       }
-      return set_id;
+      // always return empty StickerSetId, because we can't trust the set_id provided by the peer in the secret chat
+      // the real sticker set id will be set in on_get_sticker if and only if the sticker is really from the set
+      return StickerSetId();
     }
     case telegram_api::inputStickerSetAnimatedEmoji::ID:
       return add_special_sticker_set(SpecialStickerSetType(set_ptr).type_).id_;