netdev - Bug in br_handle

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Message-ID: <2c692688-ea77-1e80-6607-6577b157873a@advantech-bb.cz>
Date:   Fri, 15 Feb 2019 14:03:50 +0000
From:   Tomas Paukrt <Tomas.Paukrt@...antech-bb.cz>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
        "nikolay@...ulusnetworks.com" <nikolay@...ulusnetworks.com>
Subject: Bug in br_handle_frame

Hi,

I have recently discovered that kernel 3.12.10 is occasionally crashing 
due to NULL pointer dereference in function br_handle_frame when we 
reconfigure the bridge, because function br_port_get_rcu returns NULL.

It is very hard for us to replicate this issue, because it happens about 
once per month in our testing environment, but I have created the 
attached patch. Can you please check it? The latest kernel seems to be 
affected too.

Best regards

Tomas

View attachment "lin3-12-10-net-bridge.patch" of type "text/plain" (474 bytes)