From 7d63a3fa5f4aa0b7529a1404fb43e9480e9f0cdf Mon Sep 17 00:00:00 2001
From: Kitty Barnett <develop@catznip.com>
Date: Thu, 12 Oct 2017 22:55:15 +0200
Subject: [PATCH] [FIXED] Access (write) violation / buffer overrun in
LLTextureFetchWorker::doWork()
The trouble lines are:
U8 * buffer = (U8 *) ALLOCATE_MEM(LLImageBase::getPrivatePool(), total_size);
if (cur_size > 0)
{
memcpy(buffer, mFormattedImage->getData(), cur_size);
}
If 'cur_size > mHttpReplyOffset + append_size' then 'total_size -= src_offset' will cause
total_size to be smaller than cur_size causing a write access violation on the memcpy.
Since the response is invalid it seemed best to make it follow the other failed partial condition.
(transplanted from 737e28ec6b4d74f3ff915a4effc13d7b615a6a9b)
---
indra/newview/lltexturefetch.cpp | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/indra/newview/lltexturefetch.cpp b/indra/newview/lltexturefetch.cpp
index b78d0b51d53..64ff59f6a6a 100644
--- a/indra/newview/lltexturefetch.cpp
+++ b/indra/newview/lltexturefetch.cpp
@@ -1746,7 +1746,7 @@ bool LLTextureFetchWorker::doWork(S32 param)
// In case of a partial response, our offset may
// not be trivially contiguous with the data we have.
// Get back into alignment.
- if (mHttpReplyOffset > cur_size)
+ if ( (mHttpReplyOffset > cur_size) || (cur_size > mHttpReplyOffset + append_size))
{
LL_WARNS(LOG_TXT) << "Partial HTTP response produces break in image data for texture "
<< mID << ". Aborting load." << LL_ENDL;
--
GitLab