2 files changed, 7 insertions, 2 deletions
diff --git a/Swiften/Avatars/UnitTest/AvatarManagerImplTest.cpp b/Swiften/Avatars/UnitTest/AvatarManagerImplTest.cpp
index 241f375..5a35410 100644
--- a/Swiften/Avatars/UnitTest/AvatarManagerImplTest.cpp
+++ b/Swiften/Avatars/UnitTest/AvatarManagerImplTest.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2016 Isode Limited.
+ * Copyright (c) 2014-2018 Isode Limited.
  * All rights reserved.
  * See the COPYING file for more information.
  */
@@ -91,6 +91,7 @@ class AvatarManagerImplTest : public CppUnit::TestFixture {
             /* send new presence to notify of blank avatar */
 
             vcardUpdate = std::make_shared<VCardUpdate>();
+            vcardUpdate->setPhotoHash("da39a3ee5e6b4b0d3255bfef95601890afd80709");
             presence = std::make_shared<Presence>();
             presence->setTo(ownerJID);
             presence->setFrom(personJID);
diff --git a/Swiften/Avatars/VCardUpdateAvatarManager.cpp b/Swiften/Avatars/VCardUpdateAvatarManager.cpp
index 3e8d87b..349af2f 100644
--- a/Swiften/Avatars/VCardUpdateAvatarManager.cpp
+++ b/Swiften/Avatars/VCardUpdateAvatarManager.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010-2016 Isode Limited.
+ * Copyright (c) 2010-2018 Isode Limited.
  * All rights reserved.
  * See the COPYING file for more information.
  */
@@ -32,6 +32,10 @@ void VCardUpdateAvatarManager::handlePresenceReceived(std::shared_ptr<Presence>
         return;
     }
     JID from = getAvatarJID(presence->getFrom());
+    if (update->getPhotoHash().size() != 40) {
+        SWIFT_LOG(debug) << "Invalid vCard avatar photo hash length. Must be hex-encoded SHA-1, i.e. 40 characters." << std::endl;
+        return;
+    }
     if (getAvatarHash(from) == update->getPhotoHash()) {
         return;
     }