From 2aeb0b88b3c7a0e3bef55e7ff0efffd5d971aa57 Mon Sep 17 00:00:00 2001 From: Wang Chen Date: Mon, 14 Jul 2008 20:49:46 -0700 Subject: [PATCH] af_packet: Check return of dev_set_promiscuity/allmulti dev_set_promiscuity/allmulti might overflow. Commit: "netdevice: Fix promiscuity and allmulti overflow" in net-next makes dev_set_promiscuity/allmulti return error number if overflow happened. In af_packet, we check all positive increment for promiscuity and allmulti to get error return. Signed-off-by: Wang Chen Acked-by: Patrick McHardy Signed-off-by: David S. Miller --- net/packet/af_packet.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index beca6402f1cf..9f2269166687 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1173,7 +1173,8 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr, return 0; } -static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) +static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, + int what) { switch (i->type) { case PACKET_MR_MULTICAST: @@ -1183,13 +1184,14 @@ static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int w dev_mc_delete(dev, i->addr, i->alen, 0); break; case PACKET_MR_PROMISC: - dev_set_promiscuity(dev, what); + return dev_set_promiscuity(dev, what); break; case PACKET_MR_ALLMULTI: - dev_set_allmulti(dev, what); + return dev_set_allmulti(dev, what); break; default:; } + return 0; } static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) @@ -1243,7 +1245,11 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) i->count = 1; i->next = po->mclist; po->mclist = i; - packet_dev_mc(dev, i, +1); + err = packet_dev_mc(dev, i, 1); + if (err) { + po->mclist = i->next; + kfree(i); + } done: rtnl_unlock(); -- 2.39.5