[PATCH net] netfilter: conntrack: Pass value of ctinfo to __nf_conntrack_update

From: Nathan Chancellor
Date: Wed May 27 2020 - 04:11:24 EST

Clang warns:

net/netfilter/nf_conntrack_core.c:2068:21: warning: variable 'ctinfo' is
uninitialized when used here [-Wuninitialized]
nf_ct_set(skb, ct, ctinfo);
net/netfilter/nf_conntrack_core.c:2024:2: note: variable 'ctinfo' is
declared here
enum ip_conntrack_info ctinfo;
1 warning generated.

nf_conntrack_update was split up into nf_conntrack_update and
__nf_conntrack_update, where the assignment of ctifno is in
nf_conntrack_update but it is used in __nf_conntrack_update.

Pass the value of ctinfo from nf_conntrack_update to
__nf_conntrack_update so that uninitialized memory is not used
and everything works properly.

Fixes: ee04805ff54a ("netfilter: conntrack: make conntrack userspace helpers work again")
Link: https://github.com/ClangBuiltLinux/linux/issues/1039
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
net/netfilter/nf_conntrack_core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 08e0c19f6b39..e3b054a2f796 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -2017,11 +2017,11 @@ static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb)

static int __nf_conntrack_update(struct net *net, struct sk_buff *skb,
- struct nf_conn *ct)
+ struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo)
struct nf_conntrack_tuple_hash *h;
struct nf_conntrack_tuple tuple;
- enum ip_conntrack_info ctinfo;
struct nf_nat_hook *nat_hook;
unsigned int status;
int dataoff;
@@ -2146,7 +2146,7 @@ static int nf_conntrack_update(struct net *net, struct sk_buff *skb)
return 0;

if (!nf_ct_is_confirmed(ct)) {
- err = __nf_conntrack_update(net, skb, ct);
+ err = __nf_conntrack_update(net, skb, ct, ctinfo);
if (err < 0)
return err;

base-commit: a4976a3ef844c510ae9120290b23e9f3f47d6bce