diff options
| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-06-30 13:08:00 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-01 17:39:08 +0300 |
| commit | 14afee4b6092fde451ee17604e5f5c89da33e71e (patch) | |
| tree | 19be7a1d72a1b25c5e5366c1213cdda982aacca2 /drivers | |
| parent | 2638595afccf6554bfe55268ff9b2d3ac3dff2e6 (diff) | |
| download | linux-14afee4b6092fde451ee17604e5f5c89da33e71e.tar.xz | |
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')
| -rw-r--r-- | drivers/atm/fore200e.c | 12 | ||||
| -rw-r--r-- | drivers/atm/he.c | 2 | ||||
| -rw-r--r-- | drivers/atm/idt77252.c | 4 |
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); |