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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 17:39:08 +0300
commit14afee4b6092fde451ee17604e5f5c89da33e71e (patch)
tree19be7a1d72a1b25c5e5366c1213cdda982aacca2 /drivers/atm/fore200e.c
parent2638595afccf6554bfe55268ff9b2d3ac3dff2e6 (diff)
downloadlinux-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/atm/fore200e.c')
-rw-r--r--drivers/atm/fore200e.c12
1 files changed, 1 insertions, 11 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);