staging: gdm724x: fix use after free in gdm_lte_rx()

stable inclusion
from stable-v5.10.106
commit 6d9700b445098dbbce0caff4b8cfca214cf1e757
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IADGSJ
CVE: CVE-2022-48851

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6d9700b445098dbbce0caff4b8cfca214cf1e757



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

commit fc7f750d upstream.

The netif_rx_ni() function frees the skb so we can't dereference it to
save the skb->len.

Fixes: 61e12104 ("staging: gdm7240: adding LTE USB driver")
Cc: stable <stable@vger.kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220228074331.GA13685@kili


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Signed-off-by: Zheng Zucheng <zhengzucheng@huawei.com>