[PATCH AUTOSEL 4.9 07/13] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr()

[Sasha Levin]

From: Himadri Pandya <himadrispandya@xxxxxxxxx>

[ Upstream commit a092b7233f0e000cc6f2c71a49e2ecc6f917a5fc ]

The buffer size is 2 Bytes and we expect to receive the same amount of
data. But sometimes we receive less data and run into uninit-was-stored
issue upon read. Hence modify the error check on the return value to match
with the buffer size as a prevention.

Reported-and-tested by: syzbot+a7e220df5a81d1ab400e@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Himadri Pandya <himadrispandya@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/usb/asix_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
index 3dbb0646b0245..541c06c884e55 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -277,7 +277,7 @@ int asix_read_phy_addr(struct usbnet *dev, int internal)
 
 	netdev_dbg(dev->net, "asix_get_phy_addr()\n");
 
-	if (ret < 0) {
+	if (ret < 2) {
 		netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret);
 		goto out;
 	}
-- 
2.25.1