From 03dbe88aa9cd0d7b0a876b38bd75ce73b4522454 Mon Sep 17 00:00:00 2001 From: Joseph Qi Date: Wed, 11 Sep 2013 14:20:01 -0700 Subject: [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 Cc: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 8c50c238577a..2cd2406b4140 100644 --- a/fs/ocfs2/cluster/tcp.c +++ b/fs/ocfs2/cluster/tcp.c @@ -1873,12 +1873,16 @@ 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; }