Messages in this thread | | | From | Colin Ian King <> | Subject | re: netfilter: nfnetlink_queue: resolve clash for unconfirmed conntracks | Date | Tue, 26 May 2020 19:21:57 +0100 |
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Hi,
Static analysis with Coverity has detected a potential issue with the commit in linux-next:
commit 368982cd7d1bd41cd39049c794990aca3770db44 Author: Pablo Neira Ayuso <pablo@netfilter.org> Date: Wed May 23 09:17:24 2018 +0200
netfilter: nfnetlink_queue: resolve clash for unconfirmed conntracks
Namely:
2019 static int __nf_conntrack_update(struct net *net, struct sk_buff *skb, 2020 struct nf_conn *ct) 2021 { 2022 struct nf_conntrack_tuple_hash *h; 2023 struct nf_conntrack_tuple tuple;
1. var_decl: Declaring variable ctinfo without initializer.
2024 enum ip_conntrack_info ctinfo;
... ...
2066 nf_ct_put(ct); 2067 ct = nf_ct_tuplehash_to_ctrack(h);
Uninitialized scalar variable (UNINIT)7. uninit_use_in_call: Using uninitialized value ctinfo when calling nf_ct_set.
2068 nf_ct_set(skb, ct, ctinfo); 2069
the call to nf_ct_set uses info as follows:
316 static inline void 317 nf_ct_set(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info info) 318 { 319 skb_set_nfct(skb, (unsigned long)ct | info); 320 }
so this shows that the info arg (from ctinfo) is being used when it has not been initialized.
Colin
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