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Song Liu fa6932577c bpf: Initialize used but uninit variable in propagate_liveness()
With input changed == NULL, a local variable is used for "changed".
Initialize tmp properly, so that it can be used in the following:
   *changed |= err > 0;

Otherwise, UBSAN will complain:

UBSAN: invalid-load in kernel/bpf/verifier.c:18924:4
load of value <some random value> is not a valid value for type '_Bool'

Fixes: dfb2d4c64b ("bpf: set 'changed' status if propagate_liveness() did any updates")
Signed-off-by: Song Liu <song@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250612221100.2153401-1-song@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
History 2025-06-12 16:53:40 -07:00
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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.