linux-kernel - [PATCH 5.8 186/186] net: usb: Fix uninit-was-stored issue in asix_read_phy

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Message-Id: <20200908152250.686229315@linuxfoundation.org>
Date:   Tue,  8 Sep 2020 17:25:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Himadri Pandya <himadrispandya@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.8 186/186] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr()

From: Himadri Pandya <himadrispandya@...il.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+a7e220df5a81d1ab400e@...kaller.appspotmail.com
Signed-off-by: Himadri Pandya <himadrispandya@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 	}