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Date: Mon, 22 Jun 2015 18:54:45 +0900
From: Chanwoo Choi <cwchoi00@...il.com>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-kernel@...r.kernel.org, cwchoi00@...il.com,
myungjoo.ham@...sung.com
Subject: [PATCH] extcon: Add exception handling to prevent the NULL pointer access
This patch check whether argument is NULL to prevent NULL pointer access.
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
drivers/extcon/extcon.c | 32 +++++++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 6f03ccf..dda1e62 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -252,6 +252,9 @@ int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
unsigned long flags;
bool attached;
+ if (!edev)
+ return -EINVAL;
+
spin_lock_irqsave(&edev->lock, flags);
if (edev->state != ((edev->state & ~mask) | (state & mask))) {
@@ -320,6 +323,9 @@ EXPORT_SYMBOL_GPL(extcon_update_state);
*/
int extcon_set_state(struct extcon_dev *edev, u32 state)
{
+ if (!edev)
+ return -EINVAL;
+
return extcon_update_state(edev, 0xffffffff, state);
}
EXPORT_SYMBOL_GPL(extcon_set_state);
@@ -333,6 +339,9 @@ int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
{
int index;
+ if (!edev)
+ return -EINVAL;
+
index = find_cable_index_by_id(edev, id);
if (index < 0)
return index;
@@ -372,6 +381,9 @@ int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
u32 state;
int index;
+ if (!edev)
+ return -EINVAL;
+
index = find_cable_index_by_id(edev, id);
if (index < 0)
return index;
@@ -409,6 +421,9 @@ struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
{
struct extcon_dev *sd;
+ if (!extcon_name)
+ return ERR_PTR(-EINVAL);
+
mutex_lock(&extcon_dev_list_lock);
list_for_each_entry(sd, &extcon_dev_list, entry) {
if (!strcmp(sd->name, extcon_name))
@@ -537,6 +552,9 @@ int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
unsigned long flags;
int ret, idx;
+ if (!edev || !nb)
+ return -EINVAL;
+
idx = find_cable_index_by_id(edev, id);
spin_lock_irqsave(&edev->lock, flags);
@@ -559,6 +577,9 @@ int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
unsigned long flags;
int ret, idx;
+ if (!edev || !nb)
+ return -EINVAL;
+
idx = find_cable_index_by_id(edev, id);
spin_lock_irqsave(&edev->lock, flags);
@@ -619,6 +640,9 @@ struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
{
struct extcon_dev *edev;
+ if (!supported_cable)
+ return ERR_PTR(-EINVAL);
+
edev = kzalloc(sizeof(*edev), GFP_KERNEL);
if (!edev)
return ERR_PTR(-ENOMEM);
@@ -719,7 +743,7 @@ int extcon_dev_register(struct extcon_dev *edev)
return ret;
}
- if (!edev->supported_cable)
+ if (!edev || !edev->supported_cable)
return -EINVAL;
for (; edev->supported_cable[index] != EXTCON_NONE; index++);
@@ -925,6 +949,9 @@ void extcon_dev_unregister(struct extcon_dev *edev)
{
int index;
+ if (!edev)
+ return;
+
mutex_lock(&extcon_dev_list_lock);
list_del(&edev->entry);
mutex_unlock(&extcon_dev_list_lock);
@@ -1031,6 +1058,9 @@ struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
struct device_node *node;
struct extcon_dev *edev;
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+
if (!dev->of_node) {
dev_err(dev, "device does not have a device node entry\n");
return ERR_PTR(-EINVAL);
--
2.2.0.GIT
--
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