netdev - Re: [PATCH net] sctp: fix the issue that a __u16 variable may overflow in sctp_ulpq

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Message-Id: <20171218.132215.2106189921344751013.davem@davemloft.net>
Date:   Mon, 18 Dec 2017 13:22:15 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com
Subject: Re: [PATCH net] sctp: fix the issue that a __u16 variable may
 overflow in sctp_ulpq_renege

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 18 Dec 2017 14:07:25 +0800

> Now when reneging events in sctp_ulpq_renege(), the variable freed
> could be increased by a __u16 value twice while freed is of __u16
> type. It means freed may overflow at the second addition.
> 
> This patch is to fix it by using __u32 type for 'freed', while at
> it, also to remove 'if (chunk)' check, as all renege commands are
> generated in sctp_eat_data and it can't be NULL.
> 
> Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.