diff mbox

[net-next] ipv4: convert dst_metrics.refcnt from atomic_t to refcount_t

Message ID 1502911469.4936.148.camel@edumazet-glaptop3.roam.corp.google.com
State Superseded, archived
Delegated to: David Miller
Headers show

Commit Message

Eric Dumazet Aug. 16, 2017, 7:24 p.m. UTC 
From: Eric Dumazet <edumazet@google.com>

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>
---
 include/net/dst.h        |    2 +-
 net/core/dst.c           |    6 +++---
 net/ipv4/fib_semantics.c |    2 +-
 net/ipv4/route.c         |    4 ++--
 4 files changed, 7 insertions(+), 7 deletions(-)

Comments

Eric Dumazet Aug. 16, 2017, 11:16 p.m. UTC | #1 
On Wed, 2017-08-16 at 12:24 -0700, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@google.com>
> 
> 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>

Please disregard. I will send a v2.
diff mbox

Patch

diff --git a/include/net/dst.h b/include/net/dst.h
index f73611ec401754d4f52b5310a24da53566dafce6..dd38177c3a61f5c4e48be9d57d4d10d6b7d14672 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -107,7 +107,7 @@  struct dst_entry {
 
 struct dst_metrics {
 	u32		metrics[RTAX_MAX];
-	atomic_t	refcnt;
+	refcount_t	refcnt;
 };
 extern const struct dst_metrics dst_default_metrics;
 
diff --git a/net/core/dst.c b/net/core/dst.c
index 00aa972ad1a1a451c24f3f8211243ad35c19433a..d6ead757c25895da01eb61bc9636c7e9b3cdfb3e 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -55,7 +55,7 @@  const struct dst_metrics dst_default_metrics = {
 	 * We really want to avoid false sharing on this variable, and catch
 	 * any writes on it.
 	 */
-	.refcnt = ATOMIC_INIT(1),
+	.refcnt = REFCOUNT_INIT(1),
 };
 
 void dst_init(struct dst_entry *dst, struct dst_ops *ops,
@@ -213,7 +213,7 @@  u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)
 		struct dst_metrics *old_p = (struct dst_metrics *)__DST_METRICS_PTR(old);
 		unsigned long prev, new;
 
-		atomic_set(&p->refcnt, 1);
+		refcount_set(&p->refcnt, 1);
 		memcpy(p->metrics, old_p->metrics, sizeof(p->metrics));
 
 		new = (unsigned long) p;
@@ -225,7 +225,7 @@  u32 *dst_cow_metrics_generic(struct dst_entry *dst, unsigned long old)
 			if (prev & DST_METRICS_READ_ONLY)
 				p = NULL;
 		} else if (prev & DST_METRICS_REFCOUNTED) {
-			if (atomic_dec_and_test(&old_p->refcnt))
+			if (refcount_dec_and_test(&old_p->refcnt))
 				kfree(old_p);
 		}
 	}
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index d521caf57385fa05f76036708057b95052330cb1..dd2ac3ed82ac86f8b417852233dfea69711e982d 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -1090,7 +1090,7 @@  struct fib_info *fib_create_info(struct fib_config *cfg,
 			kfree(fi);
 			return ERR_PTR(err);
 		}
-		atomic_set(&fi->fib_metrics->refcnt, 1);
+		refcount_set(&fi->fib_metrics->refcnt, 1);
 	} else {
 		fi->fib_metrics = (struct dst_metrics *)&dst_default_metrics;
 	}
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index d400c05431063fc7bdd15b83ab540acc86decb3d..872b4cb136d3fa0cda403836cc83a156a65310a3 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1398,7 +1398,7 @@  static void ipv4_dst_destroy(struct dst_entry *dst)
 	struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
 	struct rtable *rt = (struct rtable *) dst;
 
-	if (p != &dst_default_metrics && atomic_dec_and_test(&p->refcnt))
+	if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
 		kfree(p);
 
 	if (!list_empty(&rt->rt_uncached)) {
@@ -1456,7 +1456,7 @@  static void rt_set_nexthop(struct rtable *rt, __be32 daddr,
 		dst_init_metrics(&rt->dst, fi->fib_metrics->metrics, true);
 		if (fi->fib_metrics != &dst_default_metrics) {
 			rt->dst._metrics |= DST_METRICS_REFCOUNTED;
-			atomic_inc(&fi->fib_metrics->refcnt);
+			refcount_inc(&fi->fib_metrics->refcnt);
 		}
 #ifdef CONFIG_IP_ROUTE_CLASSID
 		rt->dst.tclassid = nh->nh_tclassid;