Commit b95d71ab authored Feb 17, 2022 by Oliver Neukum Committed by Greg Kroah-Hartman Mar 02, 2022

sr9700: sanity check for packet length



commit e9da0b56fe27206b49f39805f7dcda8a89379062 upstream.

A malicious device can leak heap data to user space
providing bogus frame lengths. Introduce a sanity check.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent d0dac454

drivers/net/usb/sr9700.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -410,7 +410,7 @@ static int sr9700_rx_fixup(struct usbnet dev, struct sk_buff skb)
		/* ignore the CRC length */
		len = (skb->data[1] \| (skb->data[2] << 8)) - 4;

		if (len > ETH_FRAME_LEN)
		if (len > ETH_FRAME_LEN \|\| len > skb->len)
		return 0;

		/* the last packet of current skb */