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Petr Pavlu
588c08026d
[ Upstream commitf0a0da1f90] The event_hist_open() and event_hist_poll() functions currently retrieve a trace_event_file pointer from a file struct by invoking event_file_data(), which simply returns file->f_inode->i_private. The functions then check if the pointer is NULL to determine whether the event is still valid. This approach is flawed because i_private is assigned when an eventfs inode is allocated and remains set throughout its lifetime. Instead, the code should call event_file_file(), which checks for EVENT_FILE_FL_FREED. Using the incorrect access function may result in the code potentially opening a hist file for an event that is being removed or becoming stuck while polling on this file. Correct the access method to event_file_file() in both functions. Cc: stable@vger.kernel.org Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Tom Zanussi <zanussi@kernel.org> Link: https://patch.msgid.link/20260219162737.314231-2-petr.pavlu@suse.com Fixes:1bd13edbbe("tracing/hist: Add poll(POLLIN) support on hist file") Signed-off-by: Petr Pavlu <petr.pavlu@suse.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.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 reStructuredText 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.