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Groups > linux.kernel > #1680973

[PATCH 07/36] net, atm: convert lec_arp_table.usage 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 <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>
---
 net/atm/lec.c      | 6 +++---
 net/atm/lec_arpc.h | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/atm/lec.c b/net/atm/lec.c
index 7554571..093fe87 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -101,12 +101,12 @@ static void lec_vcc_close(struct lec_priv *priv, struct atm_vcc *vcc);
 /* must be done under lec_arp_lock */
 static inline void lec_arp_hold(struct lec_arp_table *entry)
 {
-	atomic_inc(&entry->usage);
+	refcount_inc(&entry->usage);
 }
 
 static inline void lec_arp_put(struct lec_arp_table *entry)
 {
-	if (atomic_dec_and_test(&entry->usage))
+	if (refcount_dec_and_test(&entry->usage))
 		kfree(entry);
 }
 
@@ -1564,7 +1564,7 @@ static struct lec_arp_table *make_entry(struct lec_priv *priv,
 	to_return->last_used = jiffies;
 	to_return->priv = priv;
 	skb_queue_head_init(&to_return->tx_wait);
-	atomic_set(&to_return->usage, 1);
+	refcount_set(&to_return->usage, 1);
 	return to_return;
 }
 
diff --git a/net/atm/lec_arpc.h b/net/atm/lec_arpc.h
index ec67435..d923f53 100644
--- a/net/atm/lec_arpc.h
+++ b/net/atm/lec_arpc.h
@@ -47,7 +47,7 @@ struct lec_arp_table {
 					 * the length of the tlvs array
 					 */
 	struct sk_buff_head tx_wait;	/* wait queue for outgoing packets */
-	atomic_t usage;			/* usage count */
+	refcount_t usage;		/* usage count */
 };
 
 /*
-- 
2.7.4

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[PATCH 00/36] v2 net subsystem misc refcounter conversions Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:00 +0200
  [PATCH 29/36] net, sctp: convert sctp_auth_bytes.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:00 +0200
  [PATCH 26/36] net, xfrm: convert xfrm_state.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 04/36] net, vxlan: convert vxlan_sock.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 16/36] net, netrom: convert nr_neigh.refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 11/36] net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 12/36] net, sched: convert Qdisc.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 05/36] net, decnet: convert dn_fib_info.fib_clntref from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 01/36] net, llc: convert llc_sap.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 32/36] net, sctp: convert sctp_transport.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 22/36] net, rds: convert rds_mr.r_refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 35/36] net, ax25: convert ax25_route.refcount from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 07/36] net, atm: convert lec_arp_table.usage from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 14/36] net, ipx: convert ipx_interface.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  [PATCH 31/36] net, sctp: convert sctp_chunk.refcnt from atomic_t to refcount_t Elena Reshetova <elena.reshetova@intel.com> - 2017-07-04 15:10 +0200
  Re: [PATCH 00/36] v2 net subsystem misc refcounter conversions David Miller <davem@davemloft.net> - 2017-07-05 00:10 +0200
    RE: [PATCH 00/36] v2 net subsystem misc refcounter conversions "Reshetova, Elena" <elena.reshetova@intel.com> - 2017-07-05 11:10 +0200

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