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author | Elena Reshetova | 2017-12-20 20:10:55 +0100 |
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committer | David S. Miller | 2017-12-20 21:23:44 +0100 |
commit | c380cd5a00f32a96b6c63148a939eb9f8836e184 (patch) | |
tree | e4cfa93ba6e47340d122c234027fa934776ac43a /drivers/s390/Makefile | |
parent | Merge tag 'batadv-next-for-davem-20171220' of git://git.open-mesh.org/linux-m... (diff) | |
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net: convert lcs_reply.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 lcs_reply.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>
[jwi: removed the WARN_ONs. Use CONFIG_REFCOUNT_FULL if you care.]
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/Makefile')
0 files changed, 0 insertions, 0 deletions