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@syzkaller.appspotmail.com Fixes: 6536993371fa ("bridge: mrp: Integrate MRP into the bridge") Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.
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