From 57d29a2935c9aab0aaef6264bf6a58aad3859e7c Mon Sep 17 00:00:00 2001 From: Tom Rix Date: Sat, 5 Mar 2022 10:13:46 -0800 Subject: net: rtnetlink: fix error handling in rtnl_fill_statsinfo() The clang static analyzer reports this issue rtnetlink.c:5481:2: warning: Undefined or garbage value returned to caller return err; ^~~~~~~~~~ There is a function level err variable, in the list_for_each_entry_rcu block there is a shadow err. Remove the shadow. In the same block, the call to nla_nest_start_noflag() can fail without setting an err. Set the err to -EMSGSIZE. Fixes: 216e690631f5 ("net: rtnetlink: rtnl_fill_statsinfo(): Permit non-EMSGSIZE error returns") Signed-off-by: Tom Rix Reviewed-by: Ido Schimmel Reviewed-by: Petr Machata Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core/rtnetlink.c') diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index a66b6761b88b..a759f9e0a847 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -5440,12 +5440,12 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, list_for_each_entry_rcu(af_ops, &rtnl_af_ops, list) { if (af_ops->fill_stats_af) { struct nlattr *af; - int err; af = nla_nest_start_noflag(skb, af_ops->family); if (!af) { rcu_read_unlock(); + err = -EMSGSIZE; goto nla_put_failure; } err = af_ops->fill_stats_af(skb, dev); -- cgit