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

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Message-Id: <20170714.085832.929093611392872988.davem@davemloft.net>
Date:   Fri, 14 Jul 2017 08:58:32 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     glider@...gle.com
Cc:     dvyukov@...gle.com, kcc@...gle.com, edumazet@...gle.com,
        lucien.xin@...il.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2] sctp: don't dereference ptr before leaving
 _sctp_walk_{params,errors}()

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) <\
                        ^