sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path

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In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error()
dereferences p->comm and p->pid. If the iterator's reference is the last
drop, the task is freed synchronously and the deref becomes a UAF.

Move put_task_struct() past scx_error().

Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260511214031.AF5E9C2BCB0@smtp.kernel.org/
Fixes: f0e1a0643a ("sched_ext: Implement BPF extensible scheduler class")
Cc: stable@vger.kernel.org # v6.12+
Signed-off-by: Tejun Heo <tj@kernel.org>

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Tejun Heo 2026-05-11 12:05:48 -10:00

parent 86ecb1c1a1

commit 9a415cc537

1 changed files with 1 additions and 1 deletions

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kernel/sched/ext.c

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