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net: convert inet_peer.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.
This conversion requires overall +1 on the whole
refcounting scheme.

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 2017-06-30 13:07:54 +03:00 • committed by David S. Miller
parent 574a602087
commit 1cc9a98b59
2 changed files with 11 additions and 11 deletions
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4
include/net/inetpeer.h
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@ -46,7 +46,7 @@ struct inet_peer {
struct rcu_head gc_rcu;
};
/*
* Once inet_peer is queued for deletion (refcnt == -1), following field
* Once inet_peer is queued for deletion (refcnt == 0), following field
* is not available: rid
* We can share memory with rcu_head to help keep inet_peer small.
*/
@ -60,7 +60,7 @@ struct inet_peer {
/* following fields might be frequently dirtied */
__u32 dtime; /* the time of last use of not referenced entries */
atomic_t refcnt;
refcount_t refcnt;
};
struct inet_peer_base {