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iio: trigger: close race condition in acquiring trigger reference 

In iio_trigger_write_current() we find the trigger we want while
holding mutex on the list of triggers, but we don't actually do a
get on it while holding mutex.  We wait until further validations
are completed and we're sure it's the one we want.  Race condition
is that it could be freed by the time we do the get.

Solution is to grab the trigger (iio_trigger_get) as soon as we
find it while holding mutex on the list of triggers.  If later
we decide it's not the right one, put it back. (iio_trigger_put).

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Suggested-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Alison Schofield 2017-01-21 19:28:52 -08:00 committed by Jonathan Cameron
parent dfebd8d81d
commit d5d24bcc0a
1 changed files with 13 additions and 8 deletions
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21
drivers/iio/industrialio-trigger.c
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@ -147,8 +147,7 @@ static struct iio_trigger *__iio_trigger_find_by_name(const char *name)
return NULL;
}
static struct iio_trigger *iio_trigger_find_by_name(const char *name,
size_t len)
static struct iio_trigger *iio_trigger_acquire_by_name(const char *name)
{
struct iio_trigger *trig = NULL, *iter;
@ -156,6 +155,7 @@ static struct iio_trigger *iio_trigger_find_by_name(const char *name,
list_for_each_entry(iter, &iio_trigger_list, list)
if (sysfs_streq(iter->name, name)) {
trig = iter;
iio_trigger_get(trig);
break;
}
mutex_unlock(&iio_trigger_list_lock);
@ -416,20 +416,22 @@ static ssize_t iio_trigger_write_current(struct device *dev,
}
mutex_unlock(&indio_dev->mlock);
trig = iio_trigger_find_by_name(buf, len);
if (oldtrig == trig)
return len;
trig = iio_trigger_acquire_by_name(buf);
if (oldtrig == trig) {
ret = len;
goto out_trigger_put;
}
if (trig && indio_dev->info->validate_trigger) {
ret = indio_dev->info->validate_trigger(indio_dev, trig);
if (ret)
return ret;
goto out_trigger_put;
}
if (trig && trig->ops->validate_device) {
ret = trig->ops->validate_device(trig, indio_dev);
if (ret)
return ret;
goto out_trigger_put;
}
indio_dev->trig = trig;
@ -441,13 +443,16 @@ static ssize_t iio_trigger_write_current(struct device *dev,
iio_trigger_put(oldtrig);
}
if (indio_dev->trig) {
iio_trigger_get(indio_dev->trig);
if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
iio_trigger_attach_poll_func(indio_dev->trig,
indio_dev->pollfunc_event);
}
return len;
out_trigger_put:
iio_trigger_put(trig);
return ret;
}
static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR,