summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorReshetova, Elena <elena.reshetova@intel.com>2017-07-04 15:53:24 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-04 22:35:18 +0100
commit6871584a5e493a9fa3ad330a73966908b082deac (patch)
treeb748fdcf8572c718fb270788b1fcba2041b83c8c
parent55eabed60a68e918abc44f6beb64f38cc008b29d (diff)
downloadlinux-6871584a5e493a9fa3ad330a73966908b082deac.tar.bz2
net, sctp: convert sctp_auth_bytes.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@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/sctp/auth.h5
-rw-r--r--net/sctp/auth.c4
2 files changed, 5 insertions, 4 deletions
diff --git a/include/net/sctp/auth.h b/include/net/sctp/auth.h
index 171244bd856f..e5c57d0a082d 100644
--- a/include/net/sctp/auth.h
+++ b/include/net/sctp/auth.h
@@ -31,6 +31,7 @@
#define __sctp_auth_h__
#include <linux/list.h>
+#include <linux/refcount.h>
struct sctp_endpoint;
struct sctp_association;
@@ -53,7 +54,7 @@ struct sctp_hmac {
* over SCTP-AUTH
*/
struct sctp_auth_bytes {
- atomic_t refcnt;
+ refcount_t refcnt;
__u32 len;
__u8 data[];
};
@@ -76,7 +77,7 @@ static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key)
if (!key)
return;
- atomic_inc(&key->refcnt);
+ refcount_inc(&key->refcnt);
}
void sctp_auth_key_put(struct sctp_auth_bytes *key);
diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 8ffa5985cd6e..e001b01b0e68 100644
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -63,7 +63,7 @@ void sctp_auth_key_put(struct sctp_auth_bytes *key)
if (!key)
return;
- if (atomic_dec_and_test(&key->refcnt)) {
+ if (refcount_dec_and_test(&key->refcnt)) {
kzfree(key);
SCTP_DBG_OBJCNT_DEC(keys);
}
@@ -84,7 +84,7 @@ static struct sctp_auth_bytes *sctp_auth_create_key(__u32 key_len, gfp_t gfp)
return NULL;
key->len = key_len;
- atomic_set(&key->refcnt, 1);
+ refcount_set(&key->refcnt, 1);
SCTP_DBG_OBJCNT_INC(keys);
return key;