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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 <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Reshetova, Elena 2017-07-04 09:34:56 +03:00 • committed by David S. Miller
commit 271201c09c
3 changed files with 5 additions and 5 deletions
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2
net/ipv6/addrconf.c
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@ -1050,7 +1050,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
ifa->idev = idev;
/* For caller */
in6_ifa_hold(ifa);
refcount_set(&ifa->refcnt, 1);
/* Add to big hash table */
hash = inet6_addr_hash(addr);