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intel_iommu: a fix to vtd_find_as_from_bus_num() 

Ensure the return value of vtd_find_as_from_bus_num() is NULL by
enforcing vtd_bus=NULL. This would help caller of vtd_find_as_from_bus_num()
to decide if any further operation on the returned vtd_bus.

Cc: qemu-stable@nongnu.org
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Message-Id: <1578058086-4288-2-git-send-email-yi.l.liu@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit a2e1cd41cc)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
stable-4.2
Liu Yi L 2020-01-03 21:28:05 +08:00 committed by Michael Roth
parent 7042922dd7
commit 98c74fe49a
1 changed files with 1 additions and 0 deletions
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1
hw/i386/intel_iommu.c
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@ -948,6 +948,7 @@ static VTDBus *vtd_find_as_from_bus_num(IntelIOMMUState *s, uint8_t bus_num)
return vtd_bus;
}
}
vtd_bus = NULL;
}
return vtd_bus;
}