lkml.org 
[lkml]   [2022]   [Dec]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 6.0 05/16] ACPI: processor: idle: Check acpi_fetch_acpi_dev() return value
Date
From: Li Zhong <floridsleeves@gmail.com>

[ 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 <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: Sasha Levin <sashal@kernel.org>
---
drivers/acpi/processor_idle.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 9f40917c49ef..4d1dd255c122 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))
--
2.35.1
\
 
 \ /
  Last update: 2022-12-17 16:34    [W:0.097 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site