From: Phil Sutter
> Sent: 21 August 2017 11:03
> To: Stephen Hemminger
> Cc: netdev@vger.kernel.org
> Subject: [iproute PATCH v3 4/5] tc/tc_filter: Make sure filter name is not
> empty
>
> The later check for 'k[0] != 0' requires a non-empty filter name,
> otherwise NULL pointer dereference in 'q' might happen.
>
> Signed-off-by: Phil Sutter <p...@nwl.cc>
> ---
> Changes since v2:
> - Instead of calling strlen(), just make sure **argv is not 0.
> ---
> tc/tc_filter.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/tc/tc_filter.c b/tc/tc_filter.c
> index b13fb9185d4fd..cf290ae8e252c 100644
> --- a/tc/tc_filter.c
> +++ b/tc/tc_filter.c
> @@ -412,6 +412,9 @@ static int tc_filter_get(int cmd, unsigned int flags, int
> argc, char **argv)
> usage();
> return 0;
> } else {
> + if (!**argv)
> + invarg("invalid filter name", *argv);
> +
The error message won't make sense...
David
