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net, ipv6: convert ifacaddr6.aca_refcnt from atomic_t to refcount_t

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refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Reshetova, Elena 2017-07-04 09:34:58 +03:00 • committed by David S. Miller
commit affa78bc6a
2 changed files with 4 additions and 4 deletions
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2
include/net/if_inet6.h
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@ -147,7 +147,7 @@ struct ifacaddr6 {
struct rt6_info *aca_rt;
struct ifacaddr6 *aca_next;
int aca_users;
atomic_t aca_refcnt;
refcount_t aca_refcnt;
unsigned long aca_cstamp;
unsigned long aca_tstamp;
};