From: David L Stevens Date: Sat, 9 Jul 2005 00:48:38 +0000 (-0700) Subject: [IPV4]: fix IPv4 leave-group group matching X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=84b42baef775b0e3415ccece17cf694f50326d01;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [IPV4]: fix IPv4 leave-group group matching This patch fixes the multicast group matching for IP_DROP_MEMBERSHIP, similar to the IP_ADD_MEMBERSHIP fix in a prior patch. Groups are identifiedby and including the interface address in the match will fail if a leave-group is done by address when the join was done by index, or if different addresses on the same interface are used in the join and leave. Signed-off-by: David L Stevens Signed-off-by: David S. Miller --- diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index 7af3146939dc..5088f90835ae 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -1687,24 +1687,25 @@ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) { struct inet_sock *inet = inet_sk(sk); struct ip_mc_socklist *iml, **imlp; + struct in_device *in_dev; + u32 group = imr->imr_multiaddr.s_addr; + u32 ifindex; rtnl_lock(); + in_dev = ip_mc_find_dev(imr); + if (!in_dev) { + rtnl_unlock(); + return -ENODEV; + } + ifindex = imr->imr_ifindex; for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { - if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr && - iml->multi.imr_address.s_addr==imr->imr_address.s_addr && - (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) { - struct in_device *in_dev; - - in_dev = inetdev_by_index(iml->multi.imr_ifindex); - if (in_dev) - (void) ip_mc_leave_src(sk, iml, in_dev); + if (iml->multi.imr_multiaddr.s_addr == group && + iml->multi.imr_ifindex == ifindex) { + (void) ip_mc_leave_src(sk, iml, in_dev); *imlp = iml->next; - if (in_dev) { - ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr); - in_dev_put(in_dev); - } + ip_mc_dec_group(in_dev, group); rtnl_unlock(); sock_kfree_s(sk, iml, sizeof(*iml)); return 0;