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0758b50692
full_hit() directly uses cpu as an array index. Since RING_BUFFER_ALL_CPUS == -1, calling full_hit() with cpu == RING_BUFFER_ALL_CPUS will cause an invalid memory access. The upstream commit42fb0a1e84("tracing/ring-buffer: Have polling block on watermark") already does this. This was missed when backporting to v5.4.y. This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc. Fixes:e65ac2bdda("tracing/ring-buffer: Have polling block on watermark") Signed-off-by: Pratyush Yadav <ptyadav@amazon.de> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.