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 <[email protected]> Reviewed-by: Adrien Destugues <[email protected]>
2022-04-21 18:29:50 +00:00
parent 581013b8e3
commit 0f01971951
1 changed files with 2 additions and 1 deletions
@@ -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: