From: Oliver Neukum oneukum@suse.com
[ Upstream commit a9a51bd727d141a67b589f375fe69d0e54c4fe22 ]
If a malicious device gives a short MAC it can elicit up to 5 bytes of leaked memory out of the driver. We need to check for ETH_ALEN instead.
Reported-by: syzbot+a8d4acdad35e6bbca308@syzkaller.appspotmail.com Signed-off-by: Oliver Neukum oneukum@suse.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/usb/ax88172a.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/usb/ax88172a.c +++ b/drivers/net/usb/ax88172a.c @@ -208,7 +208,7 @@ static int ax88172a_bind(struct usbnet *
/* Get the MAC address */ ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0); - if (ret < 0) { + if (ret < ETH_ALEN) { netdev_err(dev->net, "Failed to read MAC address: %d\n", ret); goto free; }