From 1391a8fa7ee59cef80c68a001118bf46047f9b12 Mon Sep 17 00:00:00 2001
From: YiFang Xiao <yifang.xiao@foxmail.com>
Date: Sat, 3 Jun 2023 09:36:18 +0800
Subject: [PATCH] fix: invalid data access of data field

bgl_babylon.cc

fix #770
---
 src/dict/bgl_babylon.cc | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/dict/bgl_babylon.cc b/src/dict/bgl_babylon.cc
index 86e14559..8e0d6c2b 100644
--- a/src/dict/bgl_babylon.cc
+++ b/src/dict/bgl_babylon.cc
@@ -382,9 +382,10 @@ bgl_entry Babylon::readEntry( ResourceHandler * resourceHandler )
           len = qFromBigEndian( *reinterpret_cast< quint32 * >( block.data + pos ) );
           pos += 4;
         }
-        else
-        {
-          len = (unsigned char)block.data[pos++];
+        else {
+          if ( pos + 1 > block.length )
+            break;
+          len = (unsigned char)block.data[ pos++ ];
         }
 
         if( pos + len > block.length )