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net, ipv6: convert inet6_ifaddr.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 09:34:56 +03:00
committed by David S. Miller
parent 1be9246077
commit 271201c09c
3 changed files with 5 additions and 5 deletions
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2
include/net/if_inet6.h
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@@ -46,7 +46,7 @@ struct inet6_ifaddr {
/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
__u32 valid_lft;
__u32 prefered_lft;
atomic_t refcnt;
refcount_t refcnt;
spinlock_t lock;
int state;