netdev - [PATCH 18/23] net, sctp: convert sctp_chunk.refcnt from atomic_t to refcount

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Message-Id: <1489752646-8749-19-git-send-email-elena.reshetova@intel.com>
Date:   Fri, 17 Mar 2017 14:10:41 +0200
From:   Elena Reshetova <elena.reshetova@...el.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        davem@...emloft.net, linux-x25@...r.kernel.org,
        linux-sctp@...r.kernel.org, vyasevich@...il.com,
        nhorman@...driver.com, linux-hams@...r.kernel.org,
        linux-nfs@...r.kernel.org, ceph-devel@...r.kernel.org,
        zyan@...hat.com, sage@...hat.com, bfields@...ldses.org,
        jlayton@...chiereds.net, steffen.klassert@...unet.com,
        herbert@...dor.apana.org.au, santosh.shilimkar@...cle.com,
        jreuter@...na.de, ralf@...ux-mips.org, peterz@...radead.org,
        keescook@...omium.org, Elena Reshetova <elena.reshetova@...el.com>,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>
Subject: [PATCH 18/23] net, sctp: convert sctp_chunk.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@...el.com>
Signed-off-by: Hans Liljestrand <ishkamiel@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: David Windsor <dwindsor@...il.com>
---
 include/net/sctp/structs.h | 2 +-
 net/sctp/sm_make_chunk.c   | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 106e1d3..7ee0c26 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -520,7 +520,7 @@ int sctp_chunk_abandoned(struct sctp_chunk *);
 struct sctp_chunk {
 	struct list_head list;
 
-	atomic_t refcnt;
+	refcount_t refcnt;
 
 	/* How many times this chunk have been sent, for prsctp RTX policy */
 	int sent_count;
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 969a30c..a54add6 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1346,7 +1346,7 @@ struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
 	INIT_LIST_HEAD(&retval->transmitted_list);
 	INIT_LIST_HEAD(&retval->frag_list);
 	SCTP_DBG_OBJCNT_INC(chunk);
-	atomic_set(&retval->refcnt, 1);
+	refcount_set(&retval->refcnt, 1);
 
 nodata:
 	return retval;
@@ -1459,13 +1459,13 @@ void sctp_chunk_free(struct sctp_chunk *chunk)
 /* Grab a reference to the chunk. */
 void sctp_chunk_hold(struct sctp_chunk *ch)
 {
-	atomic_inc(&ch->refcnt);
+	refcount_inc(&ch->refcnt);
 }
 
 /* Release a reference to the chunk. */
 void sctp_chunk_put(struct sctp_chunk *ch)
 {
-	if (atomic_dec_and_test(&ch->refcnt))
+	if (refcount_dec_and_test(&ch->refcnt))
 		sctp_chunk_destroy(ch);
 }
 
-- 
2.7.4