From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Mon, 7 Jun 2021 08:26:15 +0000 (+0200)
Subject: reset: bail if try_module_get() fails
X-Git-Tag: v4.9.276~9
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=21badeb63378360a8abb520a25ce0b41bd2db12a;p=thirdparty%2Fkernel%2Fstable.git

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 d0ebca301afc9..c15c898fe0dc0 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -263,7 +263,10 @@ 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);