[PATCH] platform/x86: asus-wmi: Potential buffer overflow in asus_wmi_evaluate_method_buf()

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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@xxxxxxxxxx>
---
 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;
-- 
2.20.1




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