netdev - [PATCH v1] ipv4: add iPv4_is_multicast() check in ip_mc_leave

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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