lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<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

Powered by Openwall GNU/*/Linux Powered by OpenVZ