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authorReshetova, Elena <elena.reshetova@intel.com>2017-06-30 13:08:00 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-01 07:39:08 -0700
commit14afee4b6092fde451ee17604e5f5c89da33e71e (patch)
tree19be7a1d72a1b25c5e5366c1213cdda982aacca2 /drivers/atm
parent2638595afccf6554bfe55268ff9b2d3ac3dff2e6 (diff)
net: convert sock.sk_wmem_alloc 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>
Diffstat (limited to 'drivers/atm')
-rw-r--r--drivers/atm/fore200e.c12
-rw-r--r--drivers/atm/he.c2
-rw-r--r--drivers/atm/idt77252.c4
3 files changed, 4 insertions, 14 deletions
diff --git a/drivers/atm/fore200e.c b/drivers/atm/fore200e.c
index 7584ae1ded85..f0433adcd8fc 100644
--- a/drivers/atm/fore200e.c
+++ b/drivers/atm/fore200e.c
@@ -924,12 +924,7 @@ fore200e_tx_irq(struct fore200e* fore200e)
else {
dev_kfree_skb_any(entry->skb);
}
-#if 1
- /* race fixed by the above incarnation mechanism, but... */
- if (atomic_read(&sk_atm(vcc)->sk_wmem_alloc) < 0) {
- atomic_set(&sk_atm(vcc)->sk_wmem_alloc, 0);
- }
-#endif
+
/* check error condition */
if (*entry->status & STATUS_ERROR)
atomic_inc(&vcc->stats->tx_err);
@@ -1130,13 +1125,9 @@ fore200e_push_rpd(struct fore200e* fore200e, struct atm_vcc* vcc, struct rpd* rp
return -ENOMEM;
}
- ASSERT(atomic_read(&sk_atm(vcc)->sk_wmem_alloc) >= 0);
-
vcc->push(vcc, skb);
atomic_inc(&vcc->stats->rx);
- ASSERT(atomic_read(&sk_atm(vcc)->sk_wmem_alloc) >= 0);
-
return 0;
}
@@ -1572,7 +1563,6 @@ fore200e_send(struct atm_vcc *vcc, struct sk_buff *skb)
unsigned long flags;
ASSERT(vcc);
- ASSERT(atomic_read(&sk_atm(vcc)->sk_wmem_alloc) >= 0);
ASSERT(fore200e);
ASSERT(fore200e_vcc);
diff --git a/drivers/atm/he.c b/drivers/atm/he.c
index 461da2bce8ef..37ee21c5a5ca 100644
--- a/drivers/atm/he.c
+++ b/drivers/atm/he.c
@@ -2395,7 +2395,7 @@ he_close(struct atm_vcc *vcc)
* TBRQ, the host issues the close command to the adapter.
*/
- while (((tx_inuse = atomic_read(&sk_atm(vcc)->sk_wmem_alloc)) > 1) &&
+ while (((tx_inuse = refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) > 1) &&
(retry < MAX_RETRY)) {
msleep(sleep);
if (sleep < 250)
diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index 4e64de380bda..60bacba03d17 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -724,7 +724,7 @@ push_on_scq(struct idt77252_dev *card, struct vc_map *vc, struct sk_buff *skb)
struct sock *sk = sk_atm(vcc);
vc->estimator->cells += (skb->len + 47) / 48;
- if (atomic_read(&sk->sk_wmem_alloc) >
+ if (refcount_read(&sk->sk_wmem_alloc) >
(sk->sk_sndbuf >> 1)) {
u32 cps = vc->estimator->maxcps;
@@ -2009,7 +2009,7 @@ idt77252_send_oam(struct atm_vcc *vcc, void *cell, int flags)
atomic_inc(&vcc->stats->tx_err);
return -ENOMEM;
}
- atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
+ refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
skb_put_data(skb, cell, 52);

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