From 9886a0345e450536434042d664c6dd78223a33e7 Mon Sep 17 00:00:00 2001
From: Christoph Borchert <christoph.borchert@tu-dortmund.de>
Date: Thu, 8 Sep 2016 10:35:33 +0200
Subject: [PATCH] bochs: fix segmentation fault in DMA controller

Change-Id: I10c3e7e89d41abdcaea374ea01a2d1613d013e4c
---
 simulators/bochs/iodev/dma.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/simulators/bochs/iodev/dma.cc b/simulators/bochs/iodev/dma.cc
index a74200e9..7afc3dce 100644
--- a/simulators/bochs/iodev/dma.cc
+++ b/simulators/bochs/iodev/dma.cc
@@ -699,6 +699,10 @@ void bx_dma_c::raise_HLDA(void)
     // wait till they're unmasked
     return;
   }
+  if (!BX_DMA_THIS s[ma_sl].chan[channel].used) {
+    //BX_PANIC(("hlda: channel %d not connected to device", channel));
+    return;
+  }
 
   //BX_DEBUG(("hlda: OK in response to DRQ(%u)", (unsigned) channel));
   phy_addr = (BX_DMA_THIS s[ma_sl].chan[channel].page_reg << 16) |