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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>
This commit is contained in:
Reshetova, Elena 2017-06-30 13:08:07 +03:00 committed by David S. Miller
parent 717d1e993a
commit edcb691871
3 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/inet_frag.h
View File

@ -50,7 +50,7 @@ struct inet_frag_queue {
spinlock_t lock;
struct timer_list timer;
struct hlist_node list;
atomic_t refcnt;
refcount_t refcnt;
struct sk_buff *fragments;
struct sk_buff *fragments_tail;
ktime_t stamp;
@ -129,7 +129,7 @@ void inet_frag_maybe_warn_overflow(struct inet_frag_queue *q,
static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
{
if (atomic_dec_and_test(&q->refcnt))
if (refcount_dec_and_test(&q->refcnt))
inet_frag_destroy(q, f);
}

14
net/ipv4/inet_fragment.c
View File

@ -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;
}

2
net/ipv4/ip_fragment.c
View File

@ -312,7 +312,7 @@ static int ip_frag_reinit(struct ipq *qp)
unsigned int sum_truesize = 0;
if (!mod_timer(&qp->q.timer, jiffies + qp->q.net->timeout)) {
atomic_inc(&qp->q.refcnt);
refcount_inc(&qp->q.refcnt);
return -ETIMEDOUT;
}