ipv4: Check return of dev_set_allmulti
allmulti might overflow.
Commit: "netdevice: Fix promiscuity and allmulti overflow" in net-next makes
dev_set_promiscuity/allmulti return error number if overflow happened.
Here, we check the positive increment for allmulti to get error return.
PS: For unwinding tunnel creating, we let ipip->ioctl() to handle it.
Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 438fab9..2f4d8af 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -118,6 +118,31 @@
/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
+static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
+{
+ dev_close(dev);
+
+ dev = __dev_get_by_name(&init_net, "tunl0");
+ if (dev) {
+ struct ifreq ifr;
+ mm_segment_t oldfs;
+ struct ip_tunnel_parm p;
+
+ memset(&p, 0, sizeof(p));
+ p.iph.daddr = v->vifc_rmt_addr.s_addr;
+ p.iph.saddr = v->vifc_lcl_addr.s_addr;
+ p.iph.version = 4;
+ p.iph.ihl = 5;
+ p.iph.protocol = IPPROTO_IPIP;
+ sprintf(p.name, "dvmrp%d", v->vifc_vifi);
+ ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
+
+ oldfs = get_fs(); set_fs(KERNEL_DS);
+ dev->do_ioctl(dev, &ifr, SIOCDELTUNNEL);
+ set_fs(oldfs);
+ }
+}
+
static
struct net_device *ipmr_new_tunnel(struct vifctl *v)
{
@@ -389,6 +414,7 @@
struct vif_device *v = &vif_table[vifi];
struct net_device *dev;
struct in_device *in_dev;
+ int err;
/* Is vif busy ? */
if (VIF_EXISTS(vifi))
@@ -406,18 +432,31 @@
dev = ipmr_reg_vif();
if (!dev)
return -ENOBUFS;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ unregister_netdevice(dev);
+ return err;
+ }
break;
#endif
case VIFF_TUNNEL:
dev = ipmr_new_tunnel(vifc);
if (!dev)
return -ENOBUFS;
+ err = dev_set_allmulti(dev, 1);
+ if (err) {
+ ipmr_del_tunnel(dev, vifc);
+ return err;
+ }
break;
case 0:
dev = ip_dev_find(&init_net, vifc->vifc_lcl_addr.s_addr);
if (!dev)
return -EADDRNOTAVAIL;
dev_put(dev);
+ err = dev_set_allmulti(dev, 1);
+ if (err)
+ return err;
break;
default:
return -EINVAL;
@@ -426,7 +465,6 @@
if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
return -EADDRNOTAVAIL;
IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
- dev_set_allmulti(dev, +1);
ip_rt_multicast_event(in_dev);
/*