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: Oliver Neukum <oneukum@suse.com>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Weilong Chen <chenweilong@huawei.com>