[PATCH 5.13 309/351] reset: bail if try_module_get() fails

Greg Kroah-Hartman
2021-07-19T17:48:16Z

From: Philipp Zabel <p.zabel@pengutronix.de>

[ 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>
---
drivers/reset/core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 71c1c8264b2d..e2a6a927b84c 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -774,7 +774,10 @@ 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);
--
2.30.2