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[Qemu-devel] [PULL 06/41] intel_iommu: allocate new key when creating ne

From: Michael S. Tsirkin
Subject: [Qemu-devel] [PULL 06/41] intel_iommu: allocate new key when creating new address space
Date: Tue, 10 Jan 2017 07:39:35 +0200

From: Jason Wang <address@hidden>

We use the pointer to stack for key for new address space, this will break hash
table searching, fixing by g_malloc() a new key instead.

Cc: Michael S. Tsirkin <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Eduardo Habkost <address@hidden>
Acked-by: Peter Xu <address@hidden>
Signed-off-by: Jason Wang <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
 hw/i386/intel_iommu.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 0dd1c8f..e39b764 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2347,12 +2347,13 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, 
PCIBus *bus, int devfn)
     char name[128];
     if (!vtd_bus) {
+        uintptr_t *new_key = g_malloc(sizeof(*new_key));
+        *new_key = (uintptr_t)bus;
         /* No corresponding free() */
         vtd_bus = g_malloc0(sizeof(VTDBus) + sizeof(VTDAddressSpace *) * \
         vtd_bus->bus = bus;
-        key = (uintptr_t)bus;
-        g_hash_table_insert(s->vtd_as_by_busptr, &key, vtd_bus);
+        g_hash_table_insert(s->vtd_as_by_busptr, new_key, vtd_bus);
     vtd_dev_as = vtd_bus->dev_as[devfn];

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