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net, ipv4: convert cipso_v4_doi.refcount from atomic_t to refcount_t

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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>
This commit is contained in:
Reshetova, Elena
2017-07-04 09:35:01 +03:00
committed by David S. Miller
parent 87078f26b6
commit f6a6fede28
2 changed files with 8 additions and 7 deletions
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3
include/net/cipso_ipv4.h
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@@ -41,6 +41,7 @@
#include <net/netlabel.h>
#include <net/request_sock.h>
#include <linux/atomic.h>
#include <linux/refcount.h>
#include <asm/unaligned.h>
/* known doi values */
@@ -85,7 +86,7 @@ struct cipso_v4_doi {
} map;
u8 tags[CIPSO_V4_TAG_MAXCNT];
atomic_t refcount;
refcount_t refcount;
struct list_head list;
struct rcu_head rcu;
};