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Subject[PATCH] platform/x86: fujitsu-laptop: add NULL check on devm_kzalloc() return value
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>
---
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
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