From 4345ece8f0bcc682f1fb3b648922c9be5f7dbe6c Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 13 Apr 2022 10:37:44 +0300
Subject: [PATCH] platform/x86: asus-wmi: Potential buffer overflow in asus_wmi_evaluate_method_buf()
Git-commit: 4345ece8f0bcc682f1fb3b648922c9be5f7dbe6c
Alt-commit: d2833762f23a62cce1636452108706541a735290
Patch-mainline: v5.18-rc5
References: git-fixes

This code tests for if the obj->buffer.length is larger than the buffer
but then it just does the memcpy() anyway.

Fixes: 0f0ac158d28f ("platform/x86: asus-wmi: Add support for custom fan curves")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220413073744.GB8812@kili
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/platform/x86/asus-wmi.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 2104a2621e50..7e3c0a8e3997 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -371,10 +371,14 @@ static int asus_wmi_evaluate_method_buf(u32 method_id,
 
 	switch (obj->type) {
 	case ACPI_TYPE_BUFFER:
-		if (obj->buffer.length > size)
+		if (obj->buffer.length > size) {
 			err = -ENOSPC;
-		if (obj->buffer.length == 0)
+			break;
+		}
+		if (obj->buffer.length == 0) {
 			err = -ENODATA;
+			break;
+		}
 
 		memcpy(ret_buffer, obj->buffer.pointer, obj->buffer.length);
 		break;
-- 
2.31.1