linux-kernel - Re: [PATCH v2] sctp: don't dereference ptr before leaving _sctp_walk

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Message-ID: <CAG_fn=UU5wT5GuFd6=br2WycHZ+JF6SWTS7=HhNLzDTiDMi-=g@mail.gmail.com>
Date:   Fri, 14 Jul 2017 18:33:01 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     David Miller <davem@...emloft.net>
Cc:     Dmitriy Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        lucien xin <lucien.xin@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] sctp: don't dereference ptr before leaving _sctp_walk_{params,errors}()

On Fri, Jul 14, 2017 at 5:58 PM, David Miller <davem@...emloft.net> wrote:
> From: Alexander Potapenko <glider@...gle.com>
> Date: Fri, 14 Jul 2017 12:03:29 +0200
>
>>  v2: per comment from David Miller, make sure the whole iterator->length
>>      fits into the remaining buffer.
>
> Please compile and functionally test your changes:
>
> In file included from ./include/linux/compiler.h:58:0,
>                  from ./include/uapi/linux/stddef.h:1,
>                  from ./include/linux/stddef.h:4,
>                  from ./include/uapi/linux/posix_types.h:4,
>                  from ./include/uapi/linux/types.h:13,
>                  from ./include/linux/types.h:5,
>                  from net/sctp/sm_statefuns.c:48:
> net/sctp/sm_statefuns.c: In function ‘sctp_sf_do_reconf’:
> ./include/net/sctp/sctp.h:472:24: error: unknown type name ‘sctp_paramhdr_t’
>       (pos.v + offsetof(sctp_paramhdr_t, length) + sizeof(pos.p->length) <\
>                         ^
Oops. Fixed.


-- 
Alexander Potapenko
Software Engineer

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