From: Vincent Whitchurch vincent.whitchurch@axis.com
stable inclusion from stable-v5.10.127 commit b07a30a774b3c3e584a68dc91779c68ea2da4813 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5XDDK
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 78601726d4a59a291acc5a52da1d3a0a6831e4e8 upstream.
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.c... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Reviewed-by: Wei Li liwei391@huawei.com --- drivers/iio/trigger/iio-trig-sysfs.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/iio/trigger/iio-trig-sysfs.c b/drivers/iio/trigger/iio-trig-sysfs.c index e09e58072872..2277d6336ac0 100644 --- a/drivers/iio/trigger/iio-trig-sysfs.c +++ b/drivers/iio/trigger/iio-trig-sysfs.c @@ -196,6 +196,7 @@ static int iio_sysfs_trigger_remove(int id) }
iio_trigger_unregister(t->trig); + irq_work_sync(&t->work); iio_trigger_free(t->trig);
list_del(&t->l);