ioemu: Add check for mapping MSI pirqs.

From: Haitao Shan <haitao.shan@intel.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/ioemu/hw/pt-msi.c b/tools/ioemu/hw/pt-msi.c
index 0af05e788f..5e7c479551 100644
--- a/tools/ioemu/hw/pt-msi.c
+++ b/tools/ioemu/hw/pt-msi.c
@@ -94,6 +94,13 @@ static int pt_msi_setup(struct pt_dev *dev)
         PT_LOG("error map msi\n");
         return -1;
     }
+
+    if ( pirq < 0 )
+    {
+        PT_LOG("invalid pirq number\n");
+        return -1;
+    }
+
     dev->msi->pirq = pirq;
     PT_LOG("msi mapped with pirq %x\n", pirq);