Joseph Qi
2013-Aug-21 07:02 UTC
[Ocfs2-devel] [PATCH] ocfs2: avoid possible NULL pointer dereference in o2net_accept_one()
Since o2nm_get_node_by_num() may return NULL, we add this check in
o2net_accept_one() to avoid possible NULL pointer dereference.
Signed-off-by: Joseph Qi <joseph.qi at huawei.com>
---
fs/ocfs2/cluster/tcp.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index aa88bd8..ec2696f 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -1870,12 +1870,16 @@ static int o2net_accept_one(struct socket *sock)
if (o2nm_this_node() >= node->nd_num) {
local_node = o2nm_get_node_by_num(o2nm_this_node());
- printk(KERN_NOTICE "o2net: Unexpected connect attempt seen "
- "at node '%s' (%u, %pI4:%d) from node '%s' (%u,
"
- "%pI4:%d)\n", local_node->nd_name, local_node->nd_num,
- &(local_node->nd_ipv4_address),
- ntohs(local_node->nd_ipv4_port), node->nd_name,
- node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port));
+ if (local_node)
+ printk(KERN_NOTICE "o2net: Unexpected connect attempt "
+ "seen at node '%s' (%u, %pI4:%d) from "
+ "node '%s' (%u, %pI4:%d)\n",
+ local_node->nd_name, local_node->nd_num,
+ &(local_node->nd_ipv4_address),
+ ntohs(local_node->nd_ipv4_port),
+ node->nd_name,
+ node->nd_num, &sin.sin_addr.s_addr,
+ ntohs(sin.sin_port));
ret = -EINVAL;
goto out;
}
--
1.7.9.7