netrom: fix copying in user data in nr_setsockopt

stable inclusion
from stable-v5.10.91
commit a7c2cae997db6d39a858f42d898d866058a7e035
bugzilla: 186187 https://gitee.com/openeuler/kernel/issues/I4SI2C

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a7c2cae997db6d39a858f42d898d866058a7e035

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

commit 3087a6f3 upstream.

This code used to copy in an unsigned long worth of data before
the sockptr_t conversion, so restore that.

Fixes: a7b75c5a ("net: pass a sockptr_t into ->setsockopt")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

net/netrom/af_netrom.c

@@ -306,7 +306,7 @@ static int nr_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(unsigned int))
 		return -EINVAL;
 
-	if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
+	if (copy_from_sockptr(&opt, optval, sizeof(unsigned long)))
 		return -EFAULT;
 
 	switch (optname) {