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net: usb: Fix uninit-was-stored issue in asix_read_phy_addr() 

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@syzkaller.appspotmail.com
Signed-off-by: Himadri Pandya <himadrispandya@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Himadri Pandya 2020-08-27 12:23:55 +05:30 committed by Greg Kroah-Hartman
parent 58c3e86d42
commit beaf13ed8e
1 changed files with 1 additions and 1 deletions
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2
drivers/net/usb/asix_common.c
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@ -296,7 +296,7 @@ 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;
}