From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Fix a null pointer deference by acpi_driver_data() if device is
null. We should only set cdev and check this is OK after we are
sure device is not null.
Smatch analysis:
drivers/acpi/fan.c:179 acpi_fan_remove() warn: variable dereferenced
before check 'device' (see line 177)
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
drivers/acpi/fan.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index f815da8..8d1c010 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -174,9 +174,13 @@ static int acpi_fan_add(struct acpi_device *device)
static int acpi_fan_remove(struct acpi_device *device)
{
- struct thermal_cooling_device *cdev = acpi_driver_data(device);
+ struct thermal_cooling_device *cdev;
+
+ if (!device)
+ return -EINVAL;
- if (!device || !cdev)
+ cdev = acpi_driver_data(device);
+ if (!cdev)
return -EINVAL;
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
--
1.7.9.5
--
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