[PATCH 21/36] net, rds: convert rds_incoming.i_refcount from atomic_t to refcount_t

[Elena Reshetova]

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.reshet...@intel.com>
Signed-off-by: Hans Liljestrand <ishkam...@gmail.com>
Signed-off-by: Kees Cook <keesc...@chromium.org>
Signed-off-by: David Windsor <dwind...@gmail.com>
---
 net/rds/rds.h  |  3 ++-
 net/rds/recv.c | 12 ++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/net/rds/rds.h b/net/rds/rds.h
index 4a25db7..35ceaa2 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -8,6 +8,7 @@
 #include <linux/mutex.h>
 #include <linux/rds.h>
 #include <linux/rhashtable.h>
+#include <linux/refcount.h>
 
 #include "info.h"
 
@@ -261,7 +262,7 @@ struct rds_ext_header_rdma_dest {
 #define        RDS_MSG_RX_CMSG         3
 
 struct rds_incoming {
-       atomic_t                i_refcount;
+       refcount_t              i_refcount;
        struct list_head        i_item;
        struct rds_connection   *i_conn;
        struct rds_conn_path    *i_conn_path;
diff --git a/net/rds/recv.c b/net/rds/recv.c
index 373a6aa1..b25bcfe 100644
--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -45,7 +45,7 @@ void rds_inc_init(struct rds_incoming *inc, struct 
rds_connection *conn,
 {
        int i;
 
-       atomic_set(&inc->i_refcount, 1);
+       refcount_set(&inc->i_refcount, 1);
        INIT_LIST_HEAD(&inc->i_item);
        inc->i_conn = conn;
        inc->i_saddr = saddr;
@@ -61,7 +61,7 @@ EXPORT_SYMBOL_GPL(rds_inc_init);
 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *cp,
                       __be32 saddr)
 {
-       atomic_set(&inc->i_refcount, 1);
+       refcount_set(&inc->i_refcount, 1);
        INIT_LIST_HEAD(&inc->i_item);
        inc->i_conn = cp->cp_conn;
        inc->i_conn_path = cp;
@@ -74,14 +74,14 @@ EXPORT_SYMBOL_GPL(rds_inc_path_init);
 
 static void rds_inc_addref(struct rds_incoming *inc)
 {
-       rdsdebug("addref inc %p ref %d\n", inc, atomic_read(&inc->i_refcount));
-       atomic_inc(&inc->i_refcount);
+       rdsdebug("addref inc %p ref %d\n", inc, 
refcount_read(&inc->i_refcount));
+       refcount_inc(&inc->i_refcount);
 }
 
 void rds_inc_put(struct rds_incoming *inc)
 {
-       rdsdebug("put inc %p ref %d\n", inc, atomic_read(&inc->i_refcount));
-       if (atomic_dec_and_test(&inc->i_refcount)) {
+       rdsdebug("put inc %p ref %d\n", inc, refcount_read(&inc->i_refcount));
+       if (refcount_dec_and_test(&inc->i_refcount)) {
                BUG_ON(!list_empty(&inc->i_item));
 
                inc->i_conn->c_trans->inc_free(inc);
-- 
2.7.4

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