sched_ext: Fix out-of-bounds access in scx_idle_init_masks()

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scx_idle_node_masks is allocated with num_possible_nodes() elements but
indexed by NUMA node IDs via for_each_node(). On systems with
non-contiguous NUMA node numbering (e.g. nodes 0 and 4), node IDs can
exceed the array size, causing out-of-bounds memory corruption.

Use nr_node_ids instead, which represents the maximum node ID range and
is the correct size for arrays indexed by node ID.

Fixes: 7c60329e3521 ("sched_ext: Add NUMA-awareness to the default idle selection policy")
Signed-off-by: David Carlier <devnexen@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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David Carlier 2026-02-25 21:15:23 +00:00 • committed by Tejun Heo

parent 83236b2e43

commit 2a064262eb

1 changed files with 2 additions and 2 deletions

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kernel/sched/ext_idle.c

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