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memory-device: avoid overflows on very huge devices 

Should not be a problem right now, but it could theoretically happen
in the future.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20181023152306.3123-7-david@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
David Hildenbrand 2018-10-23 17:23:05 +02:00 committed by Eduardo Habkost
parent 3e18dbbb13
commit 5e6aa26723
1 changed files with 2 additions and 1 deletions
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3
hw/mem/memory-device.c
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@ -85,7 +85,8 @@ static void memory_device_check_addable(MachineState *ms, uint64_t size,
/* will we exceed the total amount of memory specified */
memory_device_used_region_size(OBJECT(ms), &used_region_size);
if (used_region_size + size > ms->maxram_size - ms->ram_size) {
if (used_region_size + size < used_region_size ||
used_region_size + size > ms->maxram_size - ms->ram_size) {
error_setg(errp, "not enough space, currently 0x%" PRIx64
" in use of total space for memory devices 0x" RAM_ADDR_FMT,
used_region_size, ms->maxram_size - ms->ram_size);