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| author | Vincent Whitchurch <vincent.whitchurch@axis.com> | 2022-05-19 11:19:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-02 16:27:35 +0200 |
| commit | 31ff3309b47d98313c61b8301bf595820cc3cc33 (patch) | |
| tree | 7f8a2f378ce97b06a9ad174a8407e15570c79166 /drivers | |
| parent | ac9a8a683cb928a38ef2e7f93c7396aef73fdfeb (diff) | |
| download | linux-31ff3309b47d98313c61b8301bf595820cc3cc33.tar.gz linux-31ff3309b47d98313c61b8301bf595820cc3cc33.tar.bz2 linux-31ff3309b47d98313c61b8301bf595820cc3cc33.zip | |
iio: trigger: sysfs: fix use-after-free on remove
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.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iio/trigger/iio-trig-sysfs.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iio/trigger/iio-trig-sysfs.c b/drivers/iio/trigger/iio-trig-sysfs.c index 3f0dc9a1a514..cccc07e637a4 100644 --- a/drivers/iio/trigger/iio-trig-sysfs.c +++ b/drivers/iio/trigger/iio-trig-sysfs.c @@ -198,6 +198,7 @@ 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); |