netdev - Re: [PATCH] sctp: relese sctp_stream_priorities at sctp_stream_outq

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Date:   Thu, 24 Nov 2022 08:45:25 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     syzbot <syzbot+29c402e56c4760763cc0@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        linux-sctp@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, pabeni@...hat.com
Subject: Re: [PATCH] sctp: relese sctp_stream_priorities at
 sctp_stream_outq_migrate()

On 2022/11/23 22:57, Marcelo Ricardo Leitner wrote:
> On Wed, Nov 23, 2022 at 07:36:00PM +0900, Tetsuo Handa wrote:
>> syzbot is reporting memory leak on sctp_stream_priorities [1], for
>> sctp_stream_outq_migrate() is resetting SCTP_SO(stream, i)->ext to NULL
>> without clearing SCTP_SO(new, i)->ext->prio_head list allocated by
>> sctp_sched_prio_new_head(). Since sctp_sched_prio_free() is too late to
>> clear if stream->outcnt was already shrunk or SCTP_SO(stream, i)->ext
>> was already NULL, add a callback for clearing that list before shrinking
>> stream->outcnt and/or resetting SCTP_SO(stream, i)->ext.
>>
>> Link: https://syzkaller.appspot.com/bug?exrid=29c402e56c4760763cc0 [1]
>> Reported-by: syzbot <syzbot+29c402e56c4760763cc0@...kaller.appspotmail.com>
>> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
>> ---
>> I can observe that the reproducer no longer reports memory leak. But
>> is this change correct and sufficient? Are there similar locations?
> 
> Thanks, but please see my email from yesterday. This is on the right
> way but a cleanup then is possible:
> https://lore.kernel.org/linux-sctp/Y31ct%2FlSXNTm9ev9@t14s.localdomain/

Oops, duplicated work again. Googling with this address did not hit, and
a thread at syzkaller-bugs group did not have your patch.

Please consider including syzbot+XXXXXXXXXXXXXXXXXXXX@...kaller.appspotmail.com
and syzkaller-bugs@...glegroups.com into the Cc: list so that we can google for
your patch.