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e5c1e51980
Guillaume Nault says: ==================== l2tp: fix usage of l2tp_session_find() l2tp_session_find() doesn't take a reference on the session returned to its caller. Virtually all l2tp_session_find() users are racy, either because the session can disappear from under them or because they take a reference too late. This leads to bugs like 'use after free' or failure to notice duplicate session creations. In some cases, taking a reference on the session is not enough. The special callbacks .ref() and .deref() also have to be called in cases where the PPP pseudo-wire uses the socket associated with the session. Therefore, when looking up a session, we also have to pass a flag indicating if the .ref() callback has to be called. In the future, we probably could drop the .ref() and .deref() callbacks entirely by protecting the .sock field of struct pppol2tp_session with RCU, thus allowing it to be freed and set to NULL even if the L2TP session is still alive. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.