netdev - Re: [Bug 199643] New: UBSAN: Undefined behaviour in ./include/net/route.h:240:2

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Message-ID: <b0e36641-b84f-0bde-4c2d-125a412b5bb2@gmail.com>
Date:   Tue, 8 May 2018 08:52:35 -0600
From:   David Ahern <dsahern@...il.com>
To:     David Miller <davem@...emloft.net>, stephen@...workplumber.org
Cc:     netdev@...r.kernel.org
Subject: Re: [Bug 199643] New: UBSAN: Undefined behaviour in
 ./include/net/route.h:240:2

On 5/7/18 10:12 PM, David Miller wrote:
> From: Stephen Hemminger <stephen@...workplumber.org>
> Date: Mon, 7 May 2018 10:34:00 -0700
> 
>> Subject: [Bug 199643] New: UBSAN: Undefined behaviour in ./include/net/route.h:240:2
> 
> That's an empty line in both of my trees.
> 

In 4.16.7 it is the dst_release in:

static inline void ip_rt_put(struct rtable *rt)
{
        /* dst_release() accepts a NULL parameter.
         * We rely on dst being first structure in struct rtable
         */
        BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
--->    dst_release(&rt->dst);
}