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hwsim_netgroup counter is declarated as int, and it is incremented every time a new net is created. After sizeof(int) net are created, it will overflow, and different net namespaces will have the same identifier. This patch fixes the problem by introducing IDA instead of int counter. IDA guarantees, all the net namespaces have the uniq identifier. Note, that after we do ida_simple_remove() in hwsim_exit_net(), and we destroy the ID, later there may be executed destroy_radio() from the workqueue. But destroy_radio() does not use the ID, so it's OK. Out of bounds of this patch, just as a report to wireless subsystem maintainer, destroy_radio() increaments hwsim_radios_generation without hwsim_radio_lock, so this may need one more patch to fix. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.