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
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cn_proc.c
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
Makefile