netdev - Re: [PATCH v4 net] sctp: Free cookie before we memdup a new one

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Message-ID: <20190612180715.GC3500@localhost.localdomain>
Date:   Wed, 12 Jun 2019 15:07:15 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Neil Horman <nhorman@...driver.com>
Cc:     linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        syzbot+f7e9153b037eac9b1df8@...kaller.appspotmail.com,
        Xin Long <lucien.xin@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v4 net] sctp: Free cookie before we memdup a new one

On Tue, Jun 11, 2019 at 08:38:14PM -0400, Neil Horman wrote:
> Based on comments from Xin, even after fixes for our recent syzbot
> report of cookie memory leaks, its possible to get a resend of an INIT
> chunk which would lead to us leaking cookie memory.
> 
> To ensure that we don't leak cookie memory, free any previously
> allocated cookie first.
> 
> ---

This marker can't be here, as it causes git to loose everything below.

> Change notes
> v1->v2
> update subsystem tag in subject (davem)
> repeat kfree check for peer_random and peer_hmacs (xin)
> 
> v2->v3
> net->sctp
> also free peer_chunks
> 
> v3->v4
> fix subject tags
> 
> Signed-off-by: Neil Horman <nhorman@...driver.com>
> Reported-by: syzbot+f7e9153b037eac9b1df8@...kaller.appspotmail.com
> CC: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> CC: Xin Long <lucien.xin@...il.com>
> CC: "David S. Miller" <davem@...emloft.net>
> CC: netdev@...r.kernel.org

Anyhow, LGTM and reproducer didn't give any hits in 2 runs of 50mins.
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>