device property: set fwnode->secondary to NULL in fwnode_init()

If a firmware node is allocated on the stack (for instance: temporary
software node whose life-time we control) or on the heap - but using a
non-zeroing allocation function - and initialized using fwnode_init(),
its secondary pointer will contain uninitalized memory which likely will
be neither NULL nor IS_ERR() and so may end up being dereferenced (for
example: in dev_to_swnode()). Set fwnode->secondary to NULL on
initialization.

Cc: stable <stable@kernel.org>
Fixes: 01bb86b380a3 ("driver core: Add fwnode_init()")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://patch.msgid.link/20260506115701.23035-1-bartosz.golaszewski@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 80b38fbf2121c615cb216245bffa878aa5a531ca..31df7608737e707563090032b2c12fe10a676a9d 100644 (file)
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -208,6 +208,7 @@ struct fwnode_operations {
 static inline void fwnode_init(struct fwnode_handle *fwnode,
                               const struct fwnode_operations *ops)
 {
+       fwnode->secondary = NULL;
        fwnode->ops = ops;
        INIT_LIST_HEAD(&fwnode->consumers);
        INIT_LIST_HEAD(&fwnode->suppliers);