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ACPI: video: Fix NULL pointer dereference in acpi_video_bus_add()

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acpi_video_bus_add_notify_handler() could free video->input and
set it to NULL on failure, but this failure would be missed in its
caller acpi_video_bus_add(). As a result, when an error happens in
acpi_dev_install_notify_handler(), acpi_video_bus_add() would call
acpi_video_bus_remove_notify_handler(), where a potential NULL pointer
video->input is dereferenced in input_unregister_device().

Fix this by adding a return value check and adjusting the following
error handling code.

Fixes: 6f70168197 ("ACPI: video: Install Notify() handler directly")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dinghao Liu 2023-09-25 16:08:44 +08:00 committed by Rafael J. Wysocki
parent 6465e260f4
commit f4dcf06bc6
1 changed files with 5 additions and 2 deletions
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7
drivers/acpi/acpi_video.c
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@ -2057,7 +2057,9 @@ static int acpi_video_bus_add(struct acpi_device *device)
!auto_detect)
acpi_video_bus_register_backlight(video);
acpi_video_bus_add_notify_handler(video);
error = acpi_video_bus_add_notify_handler(video);
if (error)
goto err_del;
error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
acpi_video_bus_notify);
@ -2067,10 +2069,11 @@ static int acpi_video_bus_add(struct acpi_device *device)
return 0;
err_remove:
acpi_video_bus_remove_notify_handler(video);
err_del:
mutex_lock(&video_list_lock);
list_del(&video->entry);
mutex_unlock(&video_list_lock);
acpi_video_bus_remove_notify_handler(video);
acpi_video_bus_unregister_backlight(video);
err_put_video:
acpi_video_bus_put_devices(video);