netdev - Re: [PATCH net] sctp: check policy more carefully when getting pr status

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Date:   Mon, 29 Oct 2018 20:51:43 -0700 (PDT)
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: check policy more carefully when getting pr
 status

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 29 Oct 2018 23:13:11 +0800

> When getting pr_assocstatus and pr_streamstatus by sctp_getsockopt,
> it doesn't correctly process the case when policy is set with
> SCTP_PR_SCTP_ALL | SCTP_PR_SCTP_MASK. It even causes a
> slab-out-of-bounds in sctp_getsockopt_pr_streamstatus().
> 
> This patch fixes it by return -EINVAL for this case.
> 
> Fixes: 0ac1077e3a54 ("sctp: get pr_assoc and pr_stream all status with SCTP_PR_SCTP_ALL")
> Reported-by: syzbot+5da0d0a72a9e7d791748@...kaller.appspotmail.com
> Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable.