From 0398ba9e5a4b5675aa571e0445689d3c2e499c2d Mon Sep 17 00:00:00 2001 From: Cengiz Can Date: Mon, 7 Dec 2020 11:14:24 +0300 Subject: net: tipc: prevent possible null deref of link `tipc_node_apply_property` does a null check on a `tipc_link_entry` pointer but also accesses the same pointer out of the null check block. This triggers a warning on Coverity Static Analyzer because we're implying that `e->link` can BE null. Move "Update MTU for node link entry" line into if block to make sure that we're not in a state that `e->link` is null. Signed-off-by: Cengiz Can Signed-off-by: David S. Miller --- net/tipc/node.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/tipc/node.c b/net/tipc/node.c index c95d037fde51..83978d5dae59 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -2181,9 +2181,11 @@ void tipc_node_apply_property(struct net *net, struct tipc_bearer *b, &xmitq); else if (prop == TIPC_NLA_PROP_MTU) tipc_link_set_mtu(e->link, b->mtu); + + /* Update MTU for node link entry */ + e->mtu = tipc_link_mss(e->link); } - /* Update MTU for node link entry */ - e->mtu = tipc_link_mss(e->link); + tipc_node_write_unlock(n); tipc_bearer_xmit(net, bearer_id, &xmitq, &e->maddr, NULL); } -- cgit v1.2.3-70-g09d2