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[ Upstream commita268e0f245] proc_fs was used, in af_packet, without a surrounding #ifdef, although there is no hard dependency on proc_fs. That caused the initialization of the af_packet module to fail when CONFIG_PROC_FS=n. Specifically, proc_create_net() was used in af_packet.c, and when it fails, packet_net_init() returns -ENOMEM. It will always fail when the kernel is compiled without proc_fs, because, proc_create_net() for example always returns NULL. The calling order that starts in af_packet.c is as follows: packet_init() register_pernet_subsys() register_pernet_operations() __register_pernet_operations() ops_init() ops->init() (packet_net_ops.init=packet_net_init()) proc_create_net() It worked in the past because register_pernet_subsys()'s return value wasn't checked before this Commit36096f2f4f("packet: Fix error path in packet_init."). It always returned an error, but was not checked before, so everything was working even when CONFIG_PROC_FS=n. The fix here is simply to add the necessary #ifdef. This also fixes a similar error in tls_proc.c, that was found by Jakub Kicinski. Fixes:d26b698dd3("net/tls: add skeleton of MIB statistics") Fixes:36096f2f4f("packet: Fix error path in packet_init") Signed-off-by: Yonatan Linik <yonatanlinik@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.