[[Patch V2]] usb: asix: cleanup the buffer in asix_read_cmd

[Phong Tran]

This is for fixing KMSAN: uninit-value in asix_mdio_write
comes from syzbot.

Reported-by: syzbot+7dc7c28d4577bbe55b10@xxxxxxxxxxxxxxxxxxxxxxxxx

Tested by:

https://groups.google.com/d/msg/syzkaller-bugs/3H_n05x_sPU/07UIX_TUEgAJ

Signed-off-by: Phong Tran <tranmanphong@xxxxxxxxx>
---
 drivers/net/usb/asix_common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
index e39f41efda3e..f3eeb7875a4d 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -22,6 +22,8 @@ int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
 	else
 		fn = usbnet_read_cmd_nopm;
 
+	memset(data, 0, size);
+
 	ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 		 value, index, data, size);
 
-- 
2.20.1