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acpi/crs: Prevent bad ranges for host bridges
authorBen Widawsky <ben.widawsky@intel.com>
Mon, 26 Oct 2020 19:39:23 +0000 (12:39 -0700)
committerMichael S. Tsirkin <mst@redhat.com>
Fri, 30 Oct 2020 08:29:13 +0000 (04:29 -0400)
Prevent _CRS resources being quietly chopped off and instead throw an
assertion. _CRS is used by host bridges to declare regions of io and/or
memory that they consume. On some (all?) platforms the host bridge
doesn't have PCI header space and so they need some way to convey the
information.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Message-Id: <20201026193924.985014-1-ben.widawsky@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
hw/i386/acpi-build.c

index e3a4bc2..98ff9f5 100644 (file)
@@ -866,6 +866,8 @@ static Aml *build_crs(PCIHostState *host, CrsRangeSet *range_set)
     crs_range_merge(temp_range_set.mem_ranges);
     for (i = 0; i < temp_range_set.mem_ranges->len; i++) {
         entry = g_ptr_array_index(temp_range_set.mem_ranges, i);
+        assert(entry->limit <= UINT32_MAX &&
+               (entry->limit - entry->base + 1) <= UINT32_MAX);
         aml_append(crs,
                    aml_dword_memory(AML_POS_DECODE, AML_MIN_FIXED,
                                     AML_MAX_FIXED, AML_NON_CACHEABLE,