netdev - Re: [PATCH] bridge: mrp: Fix out-of-bounds read in br_mrp

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Message-Id: <20200525.181008.578915373174688150.davem@davemloft.net>
Date:   Mon, 25 May 2020 18:10:08 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     horatiu.vultur@...rochip.com
Cc:     nikolay@...ulusnetworks.com, roopa@...ulusnetworks.com,
        kuba@...nel.org, andrew@...n.ch, UNGLinuxDriver@...rochip.com,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+9c6f0f1f8e32223df9a4@...kaller.appspotmail.com
Subject: Re: [PATCH] bridge: mrp: Fix out-of-bounds read in br_mrp_parse

From: Horatiu Vultur <horatiu.vultur@...rochip.com>
Date: Mon, 25 May 2020 09:55:41 +0000

> The issue was reported by syzbot. When the function br_mrp_parse was
> called with a valid net_bridge_port, the net_bridge was an invalid
> pointer. Therefore the check br->stp_enabled could pass/fail
> depending where it was pointing in memory.
> The fix consists of setting the net_bridge pointer if the port is a
> valid pointer.
> 
> Reported-by: syzbot+9c6f0f1f8e32223df9a4@...kaller.appspotmail.com
> Fixes: 6536993371fa ("bridge: mrp: Integrate MRP into the bridge")
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Applied to net-next, thanks.