[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1610890456-42846-1-git-send-email-wangyingjie55@126.com>
Date: Sun, 17 Jan 2021 05:34:16 -0800
From: wangyingjie55@....com
To: davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
kuba@...nel.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
wangyingjie55@....com
Subject: [PATCH v1] ipv4: add iPv4_is_multicast() check in ip_mc_leave_group().
From: Yingjie Wang <wangyingjie55@....com>
There is no iPv4_is_multicast() check added to ip_mc_leave_group()
to check if imr->imr_multiaddr.s_addr is a multicast address.
If not a multicast address, it may result in an error.
In some cases, the callers of ip_mc_leave_group() don't check
whether it is multicast address or not before calling
such as do_ip_setsockopt(). So I suggest adding the ipv4_is_multicast()
check to the ip_mc_leave_group() to prevent this from happening.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yingjie Wang <wangyingjie55@....com>
---
net/ipv4/igmp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 7b272bbed2b4..1b6f91271cfd 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2248,6 +2248,9 @@ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
u32 ifindex;
int ret = -EADDRNOTAVAIL;
+ if (!ipv4_is_multicast(group))
+ return -EINVAL;
+
ASSERT_RTNL();
in_dev = ip_mc_find_dev(net, imr);
--
2.7.4
Powered by blists - more mailing lists