From 9620fef27ed2cdb37bf6fd028f32bea2ef5119a8 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Fri, 18 Aug 2017 12:08:07 -0700
Subject: ipv4: convert dst_metrics.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: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/dst.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'include/net/dst.h')

diff --git a/include/net/dst.h b/include/net/dst.h
index f73611ec4017..93568bd0a352 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -14,6 +14,7 @@
 #include <linux/rcupdate.h>
 #include <linux/bug.h>
 #include <linux/jiffies.h>
+#include <linux/refcount.h>
 #include <net/neighbour.h>
 #include <asm/processor.h>
 
@@ -107,7 +108,7 @@ struct dst_entry {
 
 struct dst_metrics {
 	u32		metrics[RTAX_MAX];
-	atomic_t	refcnt;
+	refcount_t	refcnt;
 };
 extern const struct dst_metrics dst_default_metrics;
 
-- 
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