net, xfrm: convert sec_path.refcnt from atomic_t to refcount_t

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 15:53:23 +03:00
committed by David S. Miller
parent 850a6212c6
commit 55eabed60a
2 changed files with 5 additions and 5 deletions

View File

@@ -116,7 +116,7 @@ struct sec_path *secpath_dup(struct sec_path *src)
for (i = 0; i < sp->len; i++)
xfrm_state_hold(sp->xvec[i]);
}
atomic_set(&sp->refcnt, 1);
refcount_set(&sp->refcnt, 1);
return sp;
}
EXPORT_SYMBOL(secpath_dup);
@@ -126,7 +126,7 @@ int secpath_set(struct sk_buff *skb)
struct sec_path *sp;
/* Allocate new secpath or COW existing one. */
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
if (!skb->sp || refcount_read(&skb->sp->refcnt) != 1) {
sp = secpath_dup(skb->sp);
if (!sp)
return -ENOMEM;