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net, ipv6: convert ifmcaddr6.mca_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 09:34:57 +03:00
committed by David S. Miller
parent 271201c09c
commit d3981bc615
2 changed files with 10 additions and 10 deletions
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2
include/net/if_inet6.h
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@@ -127,7 +127,7 @@ struct ifmcaddr6 {
struct timer_list mca_timer;
unsigned int mca_flags;
int mca_users;
atomic_t mca_refcnt;
refcount_t mca_refcnt;
spinlock_t mca_lock;
unsigned long mca_cstamp;
unsigned long mca_tstamp;