From 0f019719518b10cf34b1beadac32d321eac0188e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <jerome.duval@gmail.com>
Date: Thu, 21 Apr 2022 14:16:18 +0200
Subject: [PATCH] intel_extreme/DDI: _DpAuxTransfer(), check read buffer before
 copying to it

happens in #17713

Change-Id: I7a4214af70a9ebca8ee70c507a704771c194e92d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5223
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
---
 src/add-ons/accelerants/intel_extreme/Ports.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/add-ons/accelerants/intel_extreme/Ports.cpp b/src/add-ons/accelerants/intel_extreme/Ports.cpp
index 087ea670d8..04aaa612a8 100644
--- a/src/add-ons/accelerants/intel_extreme/Ports.cpp
+++ b/src/add-ons/accelerants/intel_extreme/Ports.cpp
@@ -1387,7 +1387,8 @@ DigitalDisplayInterface::_DpAuxTransfer(dp_aux_msg* message)
 				if (result > 0) {
 					message->reply = receiveBuffer[0] >> 4;
 					result--;
-					memcpy(message->buffer, receiveBuffer + 1, result);
+					if (message->buffer != NULL)
+						memcpy(message->buffer, receiveBuffer + 1, result);
 				}
 				break;
 			default: