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authorParthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>2016-08-10 14:07:34 +0200
committerDavid S. Miller <davem@davemloft.net>2016-08-10 17:56:52 -0700
commit672ca65d9aa8578f382784fe73578cd499664828 (patch)
treeb3b016c578ca225e824a3317ddf5e94ac6bdf5d6 /net
parent293fddff20cd6d1adf2bd59cda1f5b5e7199104a (diff)
downloadlinux-672ca65d9aa8578f382784fe73578cd499664828.tar.bz2
tipc: fix variable dereference before NULL check
In commit cf6f7e1d5109 ("tipc: dump monitor attributes"), I dereferenced a pointer before checking if its valid. This is reported by static check Smatch as: net/tipc/monitor.c:733 tipc_nl_add_monitor_peer() warn: variable dereferenced before check 'mon' (see line 731) In this commit, we check for a valid monitor before proceeding with any other operation. Fixes: cf6f7e1d5109 ("tipc: dump monitor attributes") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/tipc/monitor.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
index b62caa1c770c..ed97a5876ebe 100644
--- a/net/tipc/monitor.c
+++ b/net/tipc/monitor.c
@@ -728,12 +728,13 @@ int tipc_nl_add_monitor_peer(struct net *net, struct tipc_nl_msg *msg,
u32 bearer_id, u32 *prev_node)
{
struct tipc_monitor *mon = tipc_monitor(net, bearer_id);
- struct tipc_peer *peer = mon->self;
+ struct tipc_peer *peer;
if (!mon)
return -EINVAL;
read_lock_bh(&mon->lock);
+ peer = mon->self;
do {
if (*prev_node) {
if (peer->addr == *prev_node)