sony-laptop: potential null dereference

In the original code, if "device_enum" was NULL then it would
dereference it when it printed the error message.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index bd1b9adfbaf9..4ab898a39fea 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1311,7 +1311,11 @@ static void sony_nc_rfkill_setup(struct acpi_device *device)
         }
 
         device_enum = (union acpi_object *) buffer.pointer;
-        if (!device_enum || device_enum->type != ACPI_TYPE_BUFFER) {
+        if (!device_enum) {
+                pr_err(DRV_PFX "No SN06 return object.");
+                goto out_no_enum;
+        }
+        if (device_enum->type != ACPI_TYPE_BUFFER) {
                 pr_err(DRV_PFX "Invalid SN06 return object 0x%.2x\n",
                                 device_enum->type);
                 goto out_no_enum;