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net: tipc: prevent possible null deref of link

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`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 <cengiz@kernel.wtf>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cengiz Can 2020-12-07 11:14:24 +03:00 committed by David S. Miller
parent 9756bb63e8
commit 0398ba9e5a
1 changed files with 4 additions and 2 deletions
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6
net/tipc/node.c
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@ -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);
}