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tipc: fix out of bounds indexing

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Commit 78acb1f9b8 ("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@ericsson.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Erik Hugne 2014-04-28 08:20:09 +02:00 committed by David S. Miller
parent d37556eb1c
commit d7bb74c38c
1 changed files with 1 additions and 1 deletions
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2
net/tipc/node.c
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@ -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];