linux-stable/drivers/connector
Elena Reshetova e65f7ee39b drivers, connector: convert cn_callback_entry.refcnt from atomic_t to refcount_t
atomic_t variables are currently used to implement reference
counters with the following properties:
 - counter is initialized to 1 using atomic_set()
 - a resource is freed upon counter reaching zero
 - once counter reaches zero, its further
   increments aren't allowed
 - counter schema uses basic atomic operations
   (set, inc, inc_not_zero, dec_and_test, etc.)

Such atomic variables should be converted to a newly provided
refcount_t type and API that prevents accidental counter overflows
and underflows. This is important since overflows and underflows
can lead to use-after-free situation and be exploitable.

The variable cn_callback_entry.refcnt is used as pure reference counter.
Convert it to refcount_t and fix up the operations.

Suggested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: David Windsor <dwindsor@gmail.com>
Reviewed-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-22 02:22:39 +01:00
..
cn_proc.c connector: make cn_proc explicitly non-modular 2016-07-05 11:40:47 -07:00
cn_queue.c drivers, connector: convert cn_callback_entry.refcnt from atomic_t to refcount_t 2017-10-22 02:22:39 +01:00
connector.c drivers, connector: convert cn_callback_entry.refcnt from atomic_t to refcount_t 2017-10-22 02:22:39 +01:00
Kconfig kconfig: use bool instead of boolean for type definition attributes 2015-01-07 13:08:04 +01:00
Makefile