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boot_loader: checks whether mapping rsdt header succeeded.

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... and exits in case of failure. Reported by mt in #9895.
This commit is contained in:
Jérôme Duval
2013-07-25 18:52:06 +02:00
parent 6972b91e17
commit 0994532db4
1 changed files with 5 additions and 2 deletions
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src/system/boot/platform/bios_ia32/acpi.cpp
+5 -2
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@@ -114,8 +114,11 @@ acpi_check_rsdt(acpi_rsdp* rsdp)
rsdt = (acpi_descriptor_header*)mmu_map_physical_memory(
rsdp->rsdt_address, sizeof(acpi_descriptor_header),
kDefaultPageFlags);
if (rsdt != NULL
&& strncmp(rsdt->signature, ACPI_RSDT_SIGNATURE, 4) != 0) {
if (rsdt == NULL) {
TRACE(("acpi: couldn't map rsdt header\n"));
return B_ERROR;
}
if (strncmp(rsdt->signature, ACPI_RSDT_SIGNATURE, 4) != 0) {
mmu_free(rsdt, sizeof(acpi_descriptor_header));
rsdt = NULL;
TRACE(("acpi: invalid root system description table\n"));