tools/sched_ext: scx_flatcg: fix potential stack overflow from VLA in fcg_read_stats

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fcg_read_stats() had a VLA allocating 21 * nr_cpus * 8 bytes on the
stack, risking stack overflow on large CPU counts (nr_cpus can be up
to 512).

Fix by using a single heap allocation with the correct size, reusing
it across all stat indices, and freeing it at the end.

Signed-off-by: David Carlier <devnexen@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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David Carlier 2026-02-14 07:32:05 +00:00 • committed by Tejun Heo

parent 0b82cc331d

commit cabd76bbc0

1 changed files with 9 additions and 4 deletions

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tools/sched_ext/scx_flatcg.c

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