netdev - Re: [PATCH net] sctp: frag

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Date:   Wed, 05 Dec 2018 20:16:15 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     jakub.audykowicz@...il.com
Cc:     linux-sctp@...r.kernel.org, vyasevich@...il.com,
        nhorman@...driver.com, marcelo.leitner@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] sctp: frag_point sanity check

From: Jakub Audykowicz <jakub.audykowicz@...il.com>
Date: Tue,  4 Dec 2018 20:27:41 +0100

> If for some reason an association's fragmentation point is zero,
> sctp_datamsg_from_user will try to endlessly try to divide a message
> into zero-sized chunks. This eventually causes kernel panic due to
> running out of memory.
> 
> Although this situation is quite unlikely, it has occurred before as
> reported. I propose to add this simple last-ditch sanity check due to
> the severity of the potential consequences.
> 
> Signed-off-by: Jakub Audykowicz <jakub.audykowicz@...il.com>

Applied.