Fix potential buffer overflow in xplat/fizz/protocol/ech/Encryption.cpp

Reviewed By: AjanthanAsogamoorthy Differential Revision: D49630747 fbshipit-source-id: 3881f5480efade9cdb879eb2a54e3ae398ace707
facebookincubator · Oct 9, 2023 · 1b78334 · 1b78334
1 parent 842547e
commit 1b78334
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fizz/protocol/ech/Encryption.cpp b/fizz/protocol/ech/Encryption.cpp
@@ -489,7 +489,8 @@ size_t calculateECHPadding(
   auto sni = getExtension<ServerNameList>(chlo.extensions);
   if (sni) {
     // Add max(0, maxLen - len(server_name))
-    size_t sniLen = sni->server_name_list[0].hostname->computeChainDataLength();
+    size_t sniLen =
+        sni->server_name_list.at(0).hostname->computeChainDataLength();
     if (sniLen < maxLen) {
       padding = maxLen - sniLen;
     }