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net, llc: convert llc_sap.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 15:52:56 +03:00 committed by David S. Miller
parent bf72acefeb
commit 58951dde05
2 changed files with 4 additions and 4 deletions
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6
include/net/llc.h
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@ -55,7 +55,7 @@ struct llc_sap {
unsigned char state;
unsigned char p_bit;
unsigned char f_bit;
atomic_t refcnt;
refcount_t refcnt;
int (*rcv_func)(struct sk_buff *skb,
struct net_device *dev,
struct packet_type *pt,
@ -113,14 +113,14 @@ struct llc_sap *llc_sap_open(unsigned char lsap,
struct net_device *orig_dev));
static inline void llc_sap_hold(struct llc_sap *sap)
{
atomic_inc(&sap->refcnt);
refcount_inc(&sap->refcnt);
}
void llc_sap_close(struct llc_sap *sap);
static inline void llc_sap_put(struct llc_sap *sap)
{
if (atomic_dec_and_test(&sap->refcnt))
if (refcount_dec_and_test(&sap->refcnt))
llc_sap_close(sap);
}

2
net/llc/llc_core.c
View File

@ -41,7 +41,7 @@ static struct llc_sap *llc_sap_alloc(void)
spin_lock_init(&sap->sk_lock);
for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++)
INIT_HLIST_NULLS_HEAD(&sap->sk_laddr_hash[i], i);
atomic_set(&sap->refcnt, 1);
refcount_set(&sap->refcnt, 1);
}
return sap;
}