reset: bail if try_module_get() fails

[ Upstream commit 4fb26fb83f0def3d39c14e268bcd4003aae8fade ]

Abort instead of returning a new reset control for a reset controller
device that is going to have its module unloaded.

Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Fixes: 61fc41317666 ("reset: Add reset controller API")
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210607082615.15160-1-p.zabel@pengutronix.de
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index dbf881b586d9d09ab3e96e0a56bbcc21e92dccfc..fd7e1a3525f453f7327b6e85cae0b88fc2e099f7 100644 (file)
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -640,7 +640,10 @@ static struct reset_control *__reset_control_get_internal(
        if (!rstc)
                return ERR_PTR(-ENOMEM);
 
-       try_module_get(rcdev->owner);
+       if (!try_module_get(rcdev->owner)) {
+               kfree(rstc);
+               return ERR_PTR(-ENODEV);
+       }
 
        rstc->rcdev = rcdev;
        list_add(&rstc->list, &rcdev->reset_control_head);