[PATCH 5.8 186/186] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr()

[Greg Kroah-Hartman]

From: Himadri Pandya <himadrispan...@gmail.com>

commit a092b7233f0e000cc6f2c71a49e2ecc6f917a5fc upstream.

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+a7e220df5a81d1ab4...@syzkaller.appspotmail.com
Signed-off-by: Himadri Pandya <himadrispan...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/usb/asix_common.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -296,7 +296,7 @@ int asix_read_phy_addr(struct usbnet *de
 
        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;
        }