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net, lapb: convert lapb_cb.refcnt 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 15:53:08 +03:00 • committed by David S. Miller
parent 7b93640502
commit 0408c58be5
2 changed files with 5 additions and 4 deletions
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3
include/net/lapb.h
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@ -1,6 +1,7 @@
#ifndef _LAPB_H
#define _LAPB_H
#include <linux/lapb.h>
#include <linux/refcount.h>
#define LAPB_HEADER_LEN 20 /* LAPB over Ethernet + a bit more */
@ -101,7 +102,7 @@ struct lapb_cb {
struct lapb_frame frmr_data;
unsigned char frmr_type;
atomic_t refcnt;
refcount_t refcnt;
};
/* lapb_iface.c */