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iio: trigger: sysfs: fix use-after-free on remove

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Ensure that the irq_work has completed before the trigger is freed.

 ==================================================================
 BUG: KASAN: use-after-free in irq_work_run_list
 Read of size 8 at addr 0000000064702248 by task python3/25

 Call Trace:
  irq_work_run_list
  irq_work_tick
  update_process_times
  tick_sched_handle
  tick_sched_timer
  __hrtimer_run_queues
  hrtimer_interrupt

 Allocated by task 25:
  kmem_cache_alloc_trace
  iio_sysfs_trig_add
  dev_attr_store
  sysfs_kf_write
  kernfs_fop_write_iter
  new_sync_write
  vfs_write
  ksys_write
  sys_write

 Freed by task 25:
  kfree
  iio_sysfs_trig_remove
  dev_attr_store
  sysfs_kf_write
  kernfs_fop_write_iter
  new_sync_write
  vfs_write
  ksys_write
  sys_write

 ==================================================================

Fixes: f38bc926d022 ("staging:iio:sysfs-trigger: Use irq_work to properly active trigger")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20220519091925.1053897-1-vincent.whitchurch@axis.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Vincent Whitchurch 2022-05-19 11:19:25 +02:00 committed by Jonathan Cameron
parent b2f5ad9764
commit 78601726d4
1 changed files with 1 additions and 0 deletions
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drivers/iio/trigger/iio-trig-sysfs.c
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@ -191,6 +191,7 @@ static int iio_sysfs_trigger_remove(int id)
} }
iio_trigger_unregister(t->trig); iio_trigger_unregister(t->trig);
irq_work_sync(&t->work);
iio_trigger_free(t->trig); iio_trigger_free(t->trig);
list_del(&t->l); list_del(&t->l);