ipvlan: limit loop_qlen ranges

hulk inclusion
category: bugfix
bugzilla: 4411, https://gitee.com/openeuler/kernel/issues/I4IHL1
CVE: NA

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

In order to avoid integer overflow, we should limit
the ranges of loop_qlen value.

Fixes: 997518dea253 ("ipvlan: Introduce local xmit queue for l2e mode")
Signed-off-by: NKeefe Liu <liuqifa@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NLu Wei <luwei32@huawei.com>
Reviewed-by: NYue Haibing <yuehaibing@huawei.com>
Reviewed-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ipvlan/ipvlan_main.c

@@ -6,6 +6,9 @@
 
 static int one = 1;
 static int delay_max = 100;
+/* set loop queue length from 0 to 10 big packets(65536) */
+static int qlen_min;
+static int qlen_max = 655360;
 
 int sysctl_ipvlan_loop_qlen = 131072;
 int sysctl_ipvlan_loop_delay = 10;
@@ -29,7 +32,9 @@ static struct ctl_table ipvlan_table[] = {
 		.data           = &sysctl_ipvlan_loop_qlen,
 		.maxlen         = sizeof(int),
 		.mode           = 0644,
-		.proc_handler   = proc_dointvec,
+		.proc_handler   = proc_dointvec_minmax,
+		.extra1         = &qlen_min,
+		.extra2         = &qlen_max,
 	},
 	{ }
 };