Elena Reshetova c6d4e63e06 drivers, net, ethernet: convert mtk_eth.dma_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 mtk_eth.dma_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 02:22:38 +01:00
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Kconfig	net-next: mediatek: add platform data to adapt into various hardware	2017-08-01 15:51:48 -07:00
Makefile	net-next: mediatek: add Kconfig and Makefile	2016-03-10 16:22:12 -05:00
mtk_eth_soc.c	drivers, net, ethernet: convert mtk_eth.dma_refcnt from atomic_t to refcount_t	2017-10-22 02:22:38 +01:00
mtk_eth_soc.h	drivers, net, ethernet: convert mtk_eth.dma_refcnt from atomic_t to refcount_t	2017-10-22 02:22:38 +01:00