sr9700: sanity check for packet length

mainline inclusion
from mainline-v5.17-rc4
commit e9da0b56
category: bugfix
bugzilla: 186472, https://gitee.com/src-openeuler/kernel/issues/I4ZQIZ
CVE: CVE-2022-26966

--------------------------------

A malicious device can leak heap data to user space
providing bogus frame lengths. Introduce a sanity check.
Signed-off-by: NOliver Neukum <oneukum@suse.com>
Reviewed-by: NGrant Grundler <grundler@chromium.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>

drivers/net/usb/sr9700.c

@@ -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 */