0972457f58
Kuniyuki Iwashima says: ==================== dccp/tcp: Fix bhash2 issues related to WARN_ON() in inet_csk_get_port(). syzkaller was hitting a WARN_ON() in inet_csk_get_port() in the 4th patch, which was because we forgot to fix up bhash2 bucket when connect() for a socket bound to a wildcard address fails in __inet_stream_connect(). There was a similar report [0], but its repro does not fire the WARN_ON() due to inconsistent error handling. When connect() for a socket bound to a wildcard address fails, saddr may or may not be reset depending on where the failure happens. When we fail in __inet_stream_connect(), sk->sk_prot->disconnect() resets saddr. OTOH, in (dccp|tcp)_v[46]_connect(), if we fail after inet_hash6?_connect(), we forget to reset saddr. We fix this inconsistent error handling in the 1st patch, and then we'll fix the bhash2 WARN_ON() issue. Note that there is still an issue in that we reset saddr without checking if there are conflicting sockets in bhash and bhash2, but this should be another series. See [1][2] for the previous discussion. [0]: https://lore.kernel.org/netdev/0000000000003f33bc05dfaf44fe@google.com/ [1]: https://lore.kernel.org/netdev/20221029001249.86337-1-kuniyu@amazon.com/ [2]: https://lore.kernel.org/netdev/20221103172419.20977-1-kuniyu@amazon.com/ [3]: https://lore.kernel.org/netdev/20221118081906.053d5231@kernel.org/T/#m00aafedb29ff0b55d5e67aef0252ef1baaf4b6ee ==================== Link: https://lore.kernel.org/r/20221119014914.31792-1-kuniyu@amazon.com Signed-off-by: Jakub Kicinski <kuba@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.