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ACPI / APEI: Fix crash in apei_hest_parse() for acpi=off

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After commit 92ef2a2 (ACPI: Change the ordering of PCI root bridge
driver registrarion), acpi_hest_init() is never called for acpi=off
(acpi_disabled), so hest_disable is not set, but hest_tab is NULL,
which causes apei_hest_parse() to crash when it is called from
aer_acpi_firmware_first().

Fix that by making apei_hest_parse() check if hest_tab is not NULL
in addition to checking hest_disable.  Also remove the now useless
acpi_disabled check from apei_hest_parse().

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-02-23 00:14:57 +01:00
parent 3757b94802
commit a84363d6fd
1 changed files with 1 additions and 4 deletions
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5
drivers/acpi/apei/hest.c
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@ -89,7 +89,7 @@ int apei_hest_parse(apei_hest_func_t func, void *data)
struct acpi_hest_header *hest_hdr;
int i, rc, len;
if (hest_disable)
if (hest_disable || !hest_tab)
return -EINVAL;
hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
@ -216,9 +216,6 @@ void __init acpi_hest_init(void)
return;
}
if (acpi_disabled)
goto err;
status = acpi_get_table(ACPI_SIG_HEST, 0,
(struct acpi_table_header **)&hest_tab);
if (status == AE_NOT_FOUND)