netdev - [net 1/1] tipc: fix infinite loop when dumping link monitor summary

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]

Date:   Tue, 17 Apr 2018 21:58:27 +0200
From:   Jon Maloy <jon.maloy@...csson.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     <mohan.krishna.ghanta.krishnamurthy@...csson.com>,
        <tung.q.nguyen@...tech.com.au>, <hoang.h.le@...tech.com.au>,
        <jon.maloy@...csson.com>, <canh.d.luu@...tech.com.au>,
        <ying.xue@...driver.com>, <tipc-discussion@...ts.sourceforge.net>
Subject: [net  1/1] tipc: fix infinite loop when dumping link monitor summary

From: Tung Nguyen <tung.q.nguyen@...tech.com.au>

When configuring the number of used bearers to MAX_BEARER and issuing
command "tipc link monitor summary", the command enters infinite loop
in user space.

This issue happens because function tipc_nl_node_dump_monitor() returns
the wrong 'prev_bearer' value when all potential monitors have been
scanned.

The correct behavior is to always try to scan all monitors until either
the netlink message is full, in which case we return the bearer identity
of the affected monitor, or we continue through the whole bearer array
until we can return MAX_BEARERS. This solution also caters for the case
where there may be gaps in the bearer array.

Signed-off-by: Tung Nguyen <tung.q.nguyen@...tech.com.au>
Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
---
 net/tipc/monitor.c |  2 +-
 net/tipc/node.c    | 11 ++++-------
 2 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
index 32dc33a..5453e56 100644
--- a/net/tipc/monitor.c
+++ b/net/tipc/monitor.c
@@ -777,7 +777,7 @@ int __tipc_nl_add_monitor(struct net *net, struct tipc_nl_msg *msg,
 
 	ret = tipc_bearer_get_name(net, bearer_name, bearer_id);
 	if (ret || !mon)
-		return -EINVAL;
+		return 0;
 
 	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
 			  NLM_F_MULTI, TIPC_NL_MON_GET);
diff --git a/net/tipc/node.c b/net/tipc/node.c
index c77dd2f..6f98b56 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -2232,8 +2232,8 @@ int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
 	struct net *net = sock_net(skb->sk);
 	u32 prev_bearer = cb->args[0];
 	struct tipc_nl_msg msg;
+	int bearer_id;
 	int err;
-	int i;
 
 	if (prev_bearer == MAX_BEARERS)
 		return 0;
@@ -2243,16 +2243,13 @@ int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
 	msg.seq = cb->nlh->nlmsg_seq;
 
 	rtnl_lock();
-	for (i = prev_bearer; i < MAX_BEARERS; i++) {
-		prev_bearer = i;
+	for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
 		err = __tipc_nl_add_monitor(net, &msg, prev_bearer);
 		if (err)
-			goto out;
+			break;
 	}
-
-out:
 	rtnl_unlock();
-	cb->args[0] = prev_bearer;
+	cb->args[0] = bearer_id;
 
 	return skb->len;
 }
-- 
2.1.4