linux-kernel - [PATCH net] netfilter: nf_conntrack_sip: fix the ct_sip_parse_numerical

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Message-ID: <20230623112247.1468836-1-Ilia.Gavrilov@infotecs.ru>
Date:   Fri, 23 Jun 2023 11:23:46 +0000
From:   Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
To:     Pablo Neira Ayuso <pablo@...filter.org>
CC:     Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Patrick McHardy <kaber@...sh.net>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
        "coreteam@...filter.org" <coreteam@...filter.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>,
        Simon Horman <simon.horman@...igine.com>
Subject: [PATCH net] netfilter: nf_conntrack_sip: fix the
 ct_sip_parse_numerical_param() return value.

From: "Ilia.Gavrilov" <Ilia.Gavrilov@...otecs.ru>

ct_sip_parse_numerical_param() returns only 0 or 1 now.
But process_register_request() and process_register_response() imply
checking for a negative value if parsing of a numerical header parameter
failed.
The invocation in nf_nat_sip() looks correct:
 	if (ct_sip_parse_numerical_param(...) > 0 &&
 	    ...) { ... }

Make the return value of the function ct_sip_parse_numerical_param()
a tristate to fix all the cases
a) return 1 if value is found; *val is set
b) return 0 if value is not found; *val is unchanged
c) return -1 on error; *val is undefined

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: 0f32a40fc91a ("[NETFILTER]: nf_conntrack_sip: create signalling expectations")
Reviewed-by: Simon Horman <simon.horman@...igine.com>
Signed-off-by: Ilia.Gavrilov <Ilia.Gavrilov@...otecs.ru>
---
- Fix description
- Repost according
    https://lore.kernel.org/all/20230622144325.GC29784@breakpoint.cc/
 net/netfilter/nf_conntrack_sip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 77f5e82d8e3f..d0eac27f6ba0 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -611,7 +611,7 @@ int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 	start += strlen(name);
 	*val = simple_strtoul(start, &end, 0);
 	if (start == end)
-		return 0;
+		return -1;
 	if (matchoff && matchlen) {
 		*matchoff = start - dptr;
 		*matchlen = end - start;
-- 
2.39.2