[PATCH] platform/x86: acer-wmi: reject missing gaming WMI results

[Yousef Alhouseen]

WMI_gaming_execute_u32_u64() returns success when firmware supplies
no output object, leaving the caller output untouched.  Gaming getters
then inspect an uninitialized result value.

Return -ENOMSG for a missing object and -EINVAL for a missing output
pointer, matching the existing malformed-result handling.

Signed-off-by: Yousef Alhouseen <alhouseenyousef@xxxxxxxxx>
---
 drivers/platform/x86/acer-wmi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index e0eaaefb13d0..81d354c80cd2 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -1581,7 +1581,11 @@ static int WMI_gaming_execute_u32_u64(u32 method_id, u32 in, u64 *out)
 		return -EIO;
 
 	obj = result.pointer;
-	if (obj && out) {
+	if (!obj) {
+		ret = -ENOMSG;
+	} else if (!out) {
+		ret = -EINVAL;
+	} else {
 		switch (obj->type) {
 		case ACPI_TYPE_INTEGER:
 			*out = obj->integer.value;
-- 
2.54.0