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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> | 2022-06-29 08:59:52 +0200 |
| commit | b07a30a774b3c3e584a68dc91779c68ea2da4813 (patch) | |
| tree | 85301ad779b5ef1008c625cee359da5bbbc437c4 | |
| parent | 399788e819a17c43f275516b375b4314b6827191 (diff) | |
| download | linux-stable-b07a30a774b3c3e584a68dc91779c68ea2da4813.tar.gz linux-stable-b07a30a774b3c3e584a68dc91779c68ea2da4813.tar.bz2 linux-stable-b07a30a774b3c3e584a68dc91779c68ea2da4813.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>
| -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 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); |