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ACPI: processor: idle: Check acpi_fetch_acpi_dev() return value

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commit 2437513a814b3e93bd02879740a8a06e52e2cf7d upstream.

The return value of acpi_fetch_acpi_dev() could be NULL, which would
cause a NULL pointer dereference to occur in acpi_device_hid().

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
[ rjw: Subject and changelog edits, added empty line after if () ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Teddy Astie <teddy.astie@vates.tech>
Signed-off-by: Yann Sionneau <yann.sionneau@vates.tech>
Reported-by: Dillon C <dchan@dchan.tech>
Tested-by: Dillon C <dchan@dchan.tech>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Zhong 2022-09-02 00:37:30 -07:00 • committed by Greg Kroah-Hartman
commit 8e8b5f12ee
1 changed files with 3 additions and 1 deletions
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4
drivers/acpi/processor_idle.c
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@ -1228,7 +1228,9 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
status = acpi_get_parent(handle, &pr_ahandle);
while (ACPI_SUCCESS(status)) {
acpi_bus_get_device(pr_ahandle, &d);
if (acpi_bus_get_device(pr_ahandle, &d))
break;
handle = pr_ahandle;
if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))