From: kgv <kgv@opencascade.com>
Date: Fri, 28 Aug 2020 11:24:40 +0000 (+0300)
Subject: 0031369: Foundation Classes, Standard_ReadBuffer - access violation on second ::ReadC... 
X-Git-Tag: V7_5_0_beta~111
X-Git-Url: http://git.dev.opencascade.org/gitweb/?a=commitdiff_plain;h=68a23293059aefbc5feeb43dbbe92e728944f170;p=occt.git

0031369: Foundation Classes, Standard_ReadBuffer - access violation on second ::ReadChunk() call after read failure

Standard_ReadBuffer::readRawDataChunk() - do not increment NULL pointer and return invalid address.
---

diff --git a/src/Standard/Standard_ReadBuffer.hxx b/src/Standard/Standard_ReadBuffer.hxx
index 099a9ceb81..68e0680c7a 100644
--- a/src/Standard/Standard_ReadBuffer.hxx
+++ b/src/Standard/Standard_ReadBuffer.hxx
@@ -100,6 +100,11 @@ private:
   template<typename Stream_T>
   char* readRawDataChunk (Stream_T& theStream)
   {
+    if (myBufferPtr == NULL)
+    {
+      return NULL;
+    }
+
     myBufferPtr += myChunkLen;
     if (myBufferPtr < myBufferEnd)
     {