Re: [PATCH net] net: prevent NULL pointer dereference in rt_fibinfo_free() and rt_fibinfo_free_cpus()

[Eric Dumazet]

On Mon, Sep 9, 2024 at 8:48 PM Jeongjun Park <aha310510@xxxxxxxxx> wrote:
>
> rt_fibinfo_free() and rt_fibinfo_free_cpus() only check for rt and do not
> verify rt->dst and use it, which will result in NULL pointer dereference.
>
> Therefore, to prevent this, we need to add a check for rt->dst.
>
> Fixes: 0830106c5390 ("ipv4: take dst->__refcnt when caching dst in fib")
> Fixes: c5038a8327b9 ("ipv4: Cache routes in nexthop exception entries.")
> Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>
> ---

As far as I can tell, your patch is a NOP, and these Fixes: tags seem
random to me.

Also, I am guessing this is based on a syzbot report ?