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author | Elena Reshetova <elena.reshetova@intel.com> | 2017-10-20 10:23:45 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2017-10-22 02:22:39 +0100 |
commit | 28206cdb3bc079a97d24c33b4427395f9e406fad (patch) | |
tree | ccfef81625bbe98a5632d1ef314b7deb7f9185bb /usr | |
parent | 8676d76f087f9b2499f056aa0c5d857cffde6806 (diff) |
drivers, net: convert masces_tx_sa.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 masces_tx_sa.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>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions