Subject: Re: [PATCH v2 net] fou, fou6: do not assume linear skbs

From: Stefano Brivio <[email-masked]>
Date: Fri, 11 Jan 2019 15:39:08 +0100

On Fri, 11 Jan 2019 06:27:35 -0800
Eric Dumazet <[email-masked]> wrote:

> Both gue_err() and gue6_err() incorrectly assume
> linear skbs. Fix them to use pskb_may_pull().
> 
> BUG: KMSAN: uninit-value in gue6_err+0x475/0xc40 net/ipv6/fou6.c:101
> CPU: 0 PID: 18083 Comm: syz-executor1 Not tainted 5.0.0-rc1+ #7
>
> [...]
>
> Fixes: b8a51b38e4d4 ("fou, fou6: ICMP error handlers for FoU and GUE")
> Signed-off-by: Eric Dumazet <[email-masked]>
> Reported-by: syzbot <[email-masked]>
> Cc: Stefano Brivio <[email-masked]>
> Cc: Sabrina Dubroca <[email-masked]>

Acked-by: Stefano Brivio <[email-masked]>