On Sun, Aug 28, 2016 at 10:30:18PM +0800, fgao@xxxxxxxxxx wrote:
> From: Gao Feng <fgao@xxxxxxxxxx>
>
> The nf_log_set is an interface function, so it should do the strict sanity
> check of parameters. Add one sanity check for pf, it could not exceed
> NFPROTO_NUMPROTO, and print error log when pf is invalid.
>
> Signed-off-by: Gao Feng <fgao@xxxxxxxxxx>
> ---
> net/netfilter/nf_log.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
> index aa5847a..02ce0b9 100644
> --- a/net/netfilter/nf_log.c
> +++ b/net/netfilter/nf_log.c
> @@ -43,8 +43,10 @@ void nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger)
> {
> const struct nf_logger *log;
>
> - if (pf == NFPROTO_UNSPEC)
> + if (pf == NFPROTO_UNSPEC || pf >= NFPROTO_NUMPROTO) {
> + pr_err("Wrong pf(%d) for nf log", pf);
> return;
I'd suggest you change this function nf_log_set() to:
int nf_log_set(struct net *net, ...)
And update the callsites.
Then, you can simply return -EOPNOTSUPP instead and remove that
pr_err() message. This message is very unlikely to be displayed.
Thanks!
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