commit a3774e146a14a78e4dc84b28e841f3e91a29c6e4
author Philipp Zabel <p.zabel@pengutronix.de> Mon Jun 20 13:05:14 2016 +0200
committer Philipp Zabel <p.zabel@pengutronix.de> Wed Aug 24 15:21:36 2016 +0200
tree ea53600a171286c660dfac46959d1854c4a2e3df
parent 54e991b56639437f922113b6b12f34e8044418d8

reset: warn on invalid input to reset_control_reset/assert/deassert/status

Instead of potentially crashing, dump a backtrace and return -EINVAL if
rstc is NULL or an error code.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/reset/core.c

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 395dc9c..b8ae1db 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -138,7 +138,8 @@
  */
 int reset_control_reset(struct reset_control *rstc)
 {
-	if (WARN_ON(rstc->shared))
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)) ||
+	    WARN_ON(rstc->shared))
 		return -EINVAL;
 
 	if (rstc->rcdev->ops->reset)
@@ -161,6 +162,9 @@
  */
 int reset_control_assert(struct reset_control *rstc)
 {
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+		return -EINVAL;
+
 	if (!rstc->rcdev->ops->assert)
 		return -ENOTSUPP;
 
@@ -184,6 +188,9 @@
  */
 int reset_control_deassert(struct reset_control *rstc)
 {
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+		return -EINVAL;
+
 	if (!rstc->rcdev->ops->deassert)
 		return -ENOTSUPP;
 
@@ -204,6 +211,9 @@
  */
 int reset_control_status(struct reset_control *rstc)
 {
+	if (WARN_ON(IS_ERR_OR_NULL(rstc)))
+		return -EINVAL;
+
 	if (rstc->rcdev->ops->status)
 		return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);