bbswitch: Check for result before deref it

2011-12-13 00:07:30 +01:00
parent 398c8d2a7b
commit 6af35bd55b
1 changed files with 3 additions and 1 deletions
--- a/bbswitch.c
+++ b/bbswitch.c
@@ -63,7 +63,9 @@ static int acpi_optimus_dsm(acpi_handle handle, int func, char *args,
    obj = (union acpi_object *)output.pointer;

    if (obj->type == ACPI_TYPE_INTEGER)
-        *result = obj->integer.value;
+        if (result)
+            *result = obj->integer.value;
+
        // REVS (revision number) not found, possibly not an Optimus?
        if (obj->integer.value == 0x80000002) {
            printk(KERN_INFO "bbswitch: Optimus function not found\n");