netdev - Re: [iproute PATCH] iproute: Abort if nexthop cannot be parsed

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Date:   Mon, 16 Apr 2018 17:00:17 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jakub Sitnicki <jkbs@...hat.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [iproute PATCH] iproute: Abort if nexthop cannot be parsed

On Wed, 11 Apr 2018 11:43:11 +0200
Jakub Sitnicki <jkbs@...hat.com> wrote:

> Attempt to add a multipath route where a nexthop definition refers to a
> non-existent device causes 'ip' to crash and burn due to stack buffer
> overflow:
> 
>   # ip -6 route add fd00::1/64 nexthop dev fake1
>   Cannot find device "fake1"
>   Cannot find device "fake1"
>   Cannot find device "fake1"
>   ...
>   Segmentation fault (core dumped)
> 
> Don't ignore errors from the helper routine that parses the nexthop
> definition, and abort immediately if parsing fails.
> 
> Signed-off-by: Jakub Sitnicki <jkbs@...hat.com>

Makes sense. Applied