From: Li Zhong Date: Fri, 2 Sep 2022 07:37:30 +0000 (-0700) Subject: ACPI: processor: idle: Check acpi_fetch_acpi_dev() return value X-Git-Tag: v6.1.8~1022 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b85f0e292f73f353eea915499604fbf50c8238b4;p=platform%2Fkernel%2Flinux-starfive.git ACPI: processor: idle: Check acpi_fetch_acpi_dev() return value [ Upstream commit 2437513a814b3e93bd02879740a8a06e52e2cf7d ] 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 [ rjw: Subject and changelog edits, added empty line after if () ] Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index acfabfe..fc5b5b2 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1134,6 +1134,9 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr) status = acpi_get_parent(handle, &pr_ahandle); while (ACPI_SUCCESS(status)) { d = acpi_fetch_acpi_dev(pr_ahandle); + if (!d) + break; + handle = pr_ahandle; if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))