On Mon, 9 Dec 2024 at 22:32, Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote:
>
> Hi,
>
> On Mon, Dec 09, 2024 at 09:49:18PM +0100, Karol Przybylski wrote:
> > The comparison seclen >= 0 in net/netfilter/nfnetlink_queue.c is redundant because seclen is an unsigned value, and such comparisons are always true.
> >
> > This patch removes the unnecessary comparison replacing it with just 'greater than'
> >
> > Discovered in coverity, CID 1602243
> >
> > Signed-off-by: Karol Przybylski <karprzy7@xxxxxxxxx>
> > ---
> > net/netfilter/nfnetlink_queue.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
> > index 5110f29b2..eacb34ffb 100644
> > --- a/net/netfilter/nfnetlink_queue.c
> > +++ b/net/netfilter/nfnetlink_queue.c
> > @@ -643,7 +643,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
> >
> > if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
> > seclen = nfqnl_get_sk_secctx(entskb, &ctx);
> > - if (seclen >= 0)
> > + if (seclen > 0)
>
> What tree are you using? I don't see this code in net-next.git
linux-next, next-20241209
Link: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/net/netfilter/nfnetlink_queue.c?h=next-20241209#n646
>
> > size += nla_total_size(seclen);
> > }
> >
> > @@ -810,7 +810,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
> > }
> >
> > nlh->nlmsg_len = skb->len;
> > - if (seclen >= 0)
> > + if (seclen > 0)
> > security_release_secctx(&ctx);
> > return skb;
> >
> > @@ -819,7 +819,7 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
> > kfree_skb(skb);
> > net_err_ratelimited("nf_queue: error creating packet message\n");
> > nlmsg_failure:
> > - if (seclen >= 0)
> > + if (seclen > 0)
> > security_release_secctx(&ctx);
> > return NULL;
> > }
> > --
> > 2.34.1
> >
