netdev - Bug in br_handle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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)