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Song Liu 7969fe91c9 perf: Fix list corruption in perf_cgroup_switch()

commit 5f4e5ce638 upstream.

There's list corruption on cgrp_cpuctx_list. This happens on the
following path:

  perf_cgroup_switch: list_for_each_entry(cgrp_cpuctx_list)
      cpu_ctx_sched_in
         ctx_sched_in
            ctx_pinned_sched_in
              merge_sched_in
                  perf_cgroup_event_disable: remove the event from the list

Use list_for_each_entry_safe() to allow removing an entry during
iteration.

Fixes: 058fe1c044 ("perf/core: Make cgroup switch visit only cpuctxs with cgroup events")
Signed-off-by: Song Liu <song@kernel.org>
Reviewed-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220204004057.2961252-1-song@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-02-16 12:56:41 +01:00

callchain.c

uaccess: add force_uaccess_{begin,end} helpers

2020-08-12 10:57:59 -07:00

core.c

perf: Fix list corruption in perf_cgroup_switch()

2022-02-16 12:56:41 +01:00

hw_breakpoint.c

perf/hw_breakpoint: Replace deprecated CPU-hotplug functions

2021-08-26 09:14:36 +02:00

internal.h

perf: Optimize get_recursion_context()