netdev - [PATCH] net: ipmr: limit MRT

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Date:	Sun, 25 Nov 2012 11:44:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: [PATCH] net: ipmr: limit MRT_TABLE identifiers

From: Eric Dumazet <edumazet@...gle.com>

Name of pimreg devices are built from following format :

char name[IFNAMSIZ]; // IFNAMSIZ == 16

sprintf(name, "pimreg%u", mrt->id);

We must therefore limit mrt->id to 9 decimal digits
or risk a buffer overflow and a crash.

Restrict table identifiers in [0 ... 999999999] interval.

Reported-by: Chen Gang <gang.chen@...anux.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/ipmr.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 6168c4d..3eab2b2 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1318,6 +1318,10 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
 		if (get_user(v, (u32 __user *)optval))
 			return -EFAULT;
 
+		/* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
+		if (v != RT_TABLE_DEFAULT && v >= 1000000000)
+			return -EINVAL;
+
 		rtnl_lock();
 		ret = 0;
 		if (sk == rtnl_dereference(mrt->mroute_sk)) {


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