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authorReshetova, Elena <elena.reshetova@intel.com>2017-06-30 13:08:07 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-01 17:39:09 +0300
commitedcb691871b27c3cc463b7291afe75f1c3423406 (patch)
tree5935d0a93146c27c2c33a89c6911dbbd706a4ad5 /net/ipv4/inet_fragment.c
parent717d1e993ad8d24a711775d8f2afbcdc76a520a1 (diff)
downloadlinux-edcb691871b27c3cc463b7291afe75f1c3423406.tar.xz
net: convert inet_frag_queue.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>
Diffstat (limited to 'net/ipv4/inet_fragment.c')
-rw-r--r--net/ipv4/inet_fragment.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index b5e9317eaf9e..96e95e83cc61 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -276,11 +276,11 @@ static inline void fq_unlink(struct inet_frag_queue *fq, struct inet_frags *f)
void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
{
if (del_timer(&fq->timer))
- atomic_dec(&fq->refcnt);
+ refcount_dec(&fq->refcnt);
if (!(fq->flags & INET_FRAG_COMPLETE)) {
fq_unlink(fq, f);
- atomic_dec(&fq->refcnt);
+ refcount_dec(&fq->refcnt);
}
}
EXPORT_SYMBOL(inet_frag_kill);
@@ -329,7 +329,7 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
*/
hlist_for_each_entry(qp, &hb->chain, list) {
if (qp->net == nf && f->match(qp, arg)) {
- atomic_inc(&qp->refcnt);
+ refcount_inc(&qp->refcnt);
spin_unlock(&hb->chain_lock);
qp_in->flags |= INET_FRAG_COMPLETE;
inet_frag_put(qp_in, f);
@@ -339,9 +339,9 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
#endif
qp = qp_in;
if (!mod_timer(&qp->timer, jiffies + nf->timeout))
- atomic_inc(&qp->refcnt);
+ refcount_inc(&qp->refcnt);
- atomic_inc(&qp->refcnt);
+ refcount_inc(&qp->refcnt);
hlist_add_head(&qp->list, &hb->chain);
spin_unlock(&hb->chain_lock);
@@ -370,7 +370,7 @@ static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
spin_lock_init(&q->lock);
- atomic_set(&q->refcnt, 1);
+ refcount_set(&q->refcnt, 1);
return q;
}
@@ -405,7 +405,7 @@ struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
spin_lock(&hb->chain_lock);
hlist_for_each_entry(q, &hb->chain, list) {
if (q->net == nf && f->match(q, key)) {
- atomic_inc(&q->refcnt);
+ refcount_inc(&q->refcnt);
spin_unlock(&hb->chain_lock);
return q;
}