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authorElena Reshetova2017-10-20 12:53:34 +0300
committerAnna Schumaker2017-11-17 13:48:00 -0500
commit81a090b9975b89ca15e71d0bca945358f6fe7696 (patch)
treed8ec11c677af54e029eb66811e177662587870f9 /MAINTAINERS
parent2b28a7bee4539d27f4ec3b0298f03bfd83d4f794 (diff)
fs, nfs: convert nfs4_ff_layout_mirror.ref 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 nfs4_ff_layout_mirror.ref 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: Anna Schumaker <Anna.Schumaker@Netapp.com>
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