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Paul Walmsley 66bc9c2307 riscv: hwprobe: avoid uninitialized variable use in hwprobe_arch_id() 
[ Upstream commit b7776a802f ]

Resolve this smatch warning:

  arch/riscv/kernel/sys_hwprobe.c:50 hwprobe_arch_id() error: uninitialized symbol 'cpu_id'.

This could happen if hwprobe_arch_id() was called with a key ID of
something other than MVENDORID, MIMPID, and MARCHID.  This does not
happen in the current codebase.  The only caller of hwprobe_arch_id()
is a function that only passes one of those three key IDs.

For the sake of reducing static analyzer warning noise, and in the
unlikely event that hwprobe_arch_id() is someday called with some
other key ID, validate hwprobe_arch_id()'s input to ensure that
'cpu_id' is always initialized before use.

Fixes: ea3de9ce8a ("RISC-V: Add a syscall for HW probing")
Cc: Evan Green <evan@rivosinc.com>
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Link: https://lore.kernel.org/r/cf5a13ec-19d0-9862-059b-943f36107bf3@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-29 14:10:27 +01:00
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README 

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.