diff mbox series

[17/26] usb: gadget: configfs: remove using list iterator after loop body as a ptr

Message ID 20220306175034.3084609-18-jakobkoschel@gmail.com
State Superseded
Headers show
Series usb: gadget: remove usage of list iterator past the loop | expand

Commit Message

Jakob Koschel March 6, 2022, 5:50 p.m. UTC
If the list does not contain the expected element, the value of
list_for_each_entry() iterator will not point to a valid structure.
To avoid type confusion in such case, the list iterator
scope will be limited to list_for_each_entry() loop.

In preparation to limiting scope of a list iterator to the list traversal
loop, use a dedicated pointer to point to the found element [1].
Determining if an element was found is then simply checking if
the pointer is != NULL instead of using the potentially bogus pointer.

Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
---
 drivers/usb/gadget/configfs.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index d4a678c0806e..938cd43e74c6 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -418,7 +418,7 @@  static int config_usb_cfg_link(
 
 	struct usb_function_instance *fi =
 			to_usb_function_instance(usb_func_ci);
-	struct usb_function_instance *a_fi;
+	struct usb_function_instance *a_fi = NULL, *tmp;
 	struct usb_function *f;
 	int ret;
 
@@ -428,11 +428,13 @@  static int config_usb_cfg_link(
 	 * from another gadget or a random directory.
 	 * Also a function instance can only be linked once.
 	 */
-	list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
-		if (a_fi == fi)
+	list_for_each_entry(tmp, &gi->available_func, cfs_list) {
+		if (tmp == fi) {
+			a_fi = tmp;
 			break;
+		}
 	}
-	if (a_fi != fi) {
+	if (!a_fi) {
 		ret = -EINVAL;
 		goto out;
 	}
@@ -882,15 +884,17 @@  static int os_desc_link(struct config_item *os_desc_ci,
 	struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
 	struct usb_composite_dev *cdev = &gi->cdev;
 	struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
-	struct usb_configuration *c;
+	struct usb_configuration *c = NULL, *tmp;
 	int ret;
 
 	mutex_lock(&gi->lock);
-	list_for_each_entry(c, &cdev->configs, list) {
-		if (c == &c_target->c)
+	list_for_each_entry(tmp, &cdev->configs, list) {
+		if (tmp == &c_target->c) {
+			c = tmp;
 			break;
+		}
 	}
-	if (c != &c_target->c) {
+	if (!c) {
 		ret = -EINVAL;
 		goto out;
 	}