netdev - [PATCH 18/36] net, sunrpc: convert gss_cl_ctx.count from atomic_t to refcount

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Date:   Tue,  4 Jul 2017 15:53:13 +0300
From:   Elena Reshetova <elena.reshetova@...el.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        linux-decnet-user@...ts.sourceforge.net, davem@...emloft.net,
        jmorris@...ei.org, kaber@...sh.net, yoshfuji@...ux-ipv6.org,
        kuznet@....inr.ac.ru, 3chas3@...il.com, ralf@...ux-mips.org,
        stephen@...workplumber.org, jchapman@...alix.com, jhs@...atatu.com,
        bridge@...ts.linux-foundation.org, linux-hams@...r.kernel.org,
        linux-x25@...r.kernel.org, peterz@...radead.org,
        keescook@...omium.org, linux-rdma@...r.kernel.org,
        linux-sctp@...r.kernel.org, vyasevich@...il.com,
        nhorman@...driver.com, linux-nfs@...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,
        Elena Reshetova <elena.reshetova@...el.com>,
        Hans Liljestrand <ishkamiel@...il.com>,
        David Windsor <dwindsor@...il.com>
Subject: [PATCH 18/36] net, sunrpc: convert gss_cl_ctx.count 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/linux/sunrpc/auth_gss.h | 3 ++-
 net/sunrpc/auth_gss/auth_gss.c  | 6 +++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/linux/sunrpc/auth_gss.h b/include/linux/sunrpc/auth_gss.h
index 36eebc4..cebdf87 100644
--- a/include/linux/sunrpc/auth_gss.h
+++ b/include/linux/sunrpc/auth_gss.h
@@ -13,6 +13,7 @@
 #define _LINUX_SUNRPC_AUTH_GSS_H
 
 #ifdef __KERNEL__
+#include <linux/refcount.h>
 #include <linux/sunrpc/auth.h>
 #include <linux/sunrpc/svc.h>
 #include <linux/sunrpc/gss_api.h>
@@ -65,7 +66,7 @@ struct rpc_gss_init_res {
  * the wire when communicating with a server. */
 
 struct gss_cl_ctx {
-	atomic_t		count;
+	refcount_t		count;
 	enum rpc_gss_proc	gc_proc;
 	u32			gc_seq;
 	spinlock_t		gc_seq_lock;
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 4f16953..72f129c 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -117,14 +117,14 @@ static const struct rpc_pipe_ops gss_upcall_ops_v1;
 static inline struct gss_cl_ctx *
 gss_get_ctx(struct gss_cl_ctx *ctx)
 {
-	atomic_inc(&ctx->count);
+	refcount_inc(&ctx->count);
 	return ctx;
 }
 
 static inline void
 gss_put_ctx(struct gss_cl_ctx *ctx)
 {
-	if (atomic_dec_and_test(&ctx->count))
+	if (refcount_dec_and_test(&ctx->count))
 		gss_free_ctx(ctx);
 }
 
@@ -200,7 +200,7 @@ gss_alloc_context(void)
 		ctx->gc_proc = RPC_GSS_PROC_DATA;
 		ctx->gc_seq = 1;	/* NetApp 6.4R1 doesn't accept seq. no. 0 */
 		spin_lock_init(&ctx->gc_seq_lock);
-		atomic_set(&ctx->count,1);
+		refcount_set(&ctx->count,1);
 	}
 	return ctx;
 }
-- 
2.7.4