netdev - [PATCH net-next] tipc: fix out of bounds indexing

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Date:	Mon, 28 Apr 2014 08:20:09 +0200
From:	<erik.hugne@...csson.com>
To:	<netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net>,
	<jon.maloy@...csson.com>, <maloy@...jonn.com>
CC:	<ying.xue@...driver.com>, <paul.gortmaker@...driver.com>,
	<richard.alpe@...csson.com>, Erik Hugne <erik.hugne@...csson.com>
Subject: [PATCH net-next] tipc: fix out of bounds indexing

From: Erik Hugne <erik.hugne@...csson.com>

Commit 78acb1f9b898e85fa2c1e28e700b54b66b288e8d ("tipc: add
ioctl to fetch link names") introduced a buffer overflow bug where
specially crafted ioctl requests could cause out-of-bounds indexing
of the node->links array. This was caused by an incorrect check vs
MAX_BEARERS, and the static code checker complaint is:
net/tipc/node.c:459 tipc_node_get_linkname() error: buffer overflow 'node->links' 2 <= 2

Signed-off-by: Erik Hugne <erik.hugne@...csson.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 net/tipc/node.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 1f938f3..6d6543e 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -453,7 +453,7 @@ int tipc_node_get_linkname(u32 bearer_id, u32 addr, char *linkname, size_t len)
 	struct tipc_link *link;
 	struct tipc_node *node = tipc_node_find(addr);
 
-	if ((bearer_id > MAX_BEARERS) || !node)
+	if ((bearer_id >= MAX_BEARERS) || !node)
 		return -EINVAL;
 	tipc_node_lock(node);
 	link = node->links[bearer_id];
-- 
1.8.3.2

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