lkml.org 
[lkml]   [2017]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] platform/x86: fujitsu-laptop: add NULL check on devm_kzalloc() return value
On Thu, Jul 06, 2017 at 05:19:02PM -0500, Gustavo A. R. Silva wrote:
> Check return value from call to devm_kzalloc()
> in order to prevent a NULL pointer dereference.
>
> This issue was detected using Coccinelle and the following semantic patch:
>
> @@
> expression x;
> identifier fld;
> @@
>
> * x = devm_kzalloc(...);
> ... when != x == NULL
> x->fld
>
> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>

These checks should be added in the interest of code correctness.
devm_kzalloc() can fail (even if it's extremely unlikely in practice) so we
should check for this.

Reviewed-by: Jonathan Woithe <jwoithe@just42.net>

> ---
> drivers/platform/x86/fujitsu-laptop.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> index c1a8528..593a350 100644
> --- a/drivers/platform/x86/fujitsu-laptop.c
> +++ b/drivers/platform/x86/fujitsu-laptop.c
> @@ -695,6 +695,9 @@ static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
> if (call_fext_func(device,
> FUNC_LEDS, 0x0, 0x0, 0x0) & LOGOLAMP_POWERON) {
> led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> +
> led->name = "fujitsu::logolamp";
> led->brightness_set_blocking = logolamp_set;
> led->brightness_get = logolamp_get;
> @@ -707,6 +710,9 @@ static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
> FUNC_LEDS, 0x0, 0x0, 0x0) & KEYBOARD_LAMPS) &&
> (call_fext_func(device, FUNC_BUTTONS, 0x0, 0x0, 0x0) == 0x0)) {
> led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> +
> led->name = "fujitsu::kblamps";
> led->brightness_set_blocking = kblamps_set;
> led->brightness_get = kblamps_get;
> @@ -723,6 +729,9 @@ static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
> */
> if (call_fext_func(device, FUNC_BUTTONS, 0x0, 0x0, 0x0) & BIT(24)) {
> led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> +
> led->name = "fujitsu::radio_led";
> led->brightness_set_blocking = radio_led_set;
> led->brightness_get = radio_led_get;
> @@ -741,6 +750,9 @@ static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
> (call_fext_func(device,
> FUNC_LEDS, 0x2, ECO_LED, 0x0) != UNSUPPORTED_CMD)) {
> led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> +
> led->name = "fujitsu::eco_led";
> led->brightness_set_blocking = eco_led_set;
> led->brightness_get = eco_led_get;
> --
> 2.5.0

\
 
 \ /
  Last update: 2017-07-07 02:20    [W:0.048 / U:2.880 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site