[Xen-changelog] [xen-3.0.5-testing] [qemu-dm] Check for null pointer in dma handler function pointer.

["Xen patchbot-3.0.5-testing" <patchbot-3.0.5-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Christian Limpach <Christian.Limpach@xxxxxxxxxxxxx>
# Date 1177430530 -3600
# Node ID c1d3f4fbfacf7ea8eab9549823787f13efa2d976
# Parent  837d12d4d2d15be322b2fc9a1eb925ddfdcbd3d9
[qemu-dm] Check for null pointer in dma handler function pointer.

Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxxx>
---
 tools/ioemu/hw/dma.c |    2 ++
 1 files changed, 2 insertions(+)

diff -r 837d12d4d2d1 -r c1d3f4fbfacf tools/ioemu/hw/dma.c
--- a/tools/ioemu/hw/dma.c      Tue Apr 24 17:02:09 2007 +0100
+++ b/tools/ioemu/hw/dma.c      Tue Apr 24 17:02:10 2007 +0100
@@ -340,6 +340,8 @@ static void channel_run (int ncont, int 
 #endif
 
     r = dma_controllers[ncont].regs + ichan;
+    if (r->transfer_handler == NULL)
+       return;
     n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
                              r->now[COUNT], (r->base[COUNT] + 1) << ncont);
     r->now[COUNT] = n;

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