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net, bridge: convert net_bridge_vlan.refcnt 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>
This commit is contained in:
Reshetova, Elena 2017-07-04 15:53:05 +03:00 committed by David S. Miller
parent e00bdbefab
commit 2512775985
2 changed files with 6 additions and 5 deletions
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3
net/bridge/br_private.h
View File

@ -21,6 +21,7 @@
#include <net/ip6_fib.h>
#include <linux/if_vlan.h>
#include <linux/rhashtable.h>
#include <linux/refcount.h>
#define BR_HASH_BITS 8
#define BR_HASH_SIZE (1 << BR_HASH_BITS)
@ -127,7 +128,7 @@ struct net_bridge_vlan {
struct net_bridge_port *port;
};
union {
atomic_t refcnt;
refcount_t refcnt;
struct net_bridge_vlan *brvlan;
};

8
net/bridge/br_vlan.c
View File

@ -158,7 +158,7 @@ static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid
if (WARN_ON(!masterv))
return NULL;
}
atomic_inc(&masterv->refcnt);
refcount_inc(&masterv->refcnt);
return masterv;
}
@ -182,7 +182,7 @@ static void br_vlan_put_master(struct net_bridge_vlan *masterv)
return;
vg = br_vlan_group(masterv->br);
if (atomic_dec_and_test(&masterv->refcnt)) {
if (refcount_dec_and_test(&masterv->refcnt)) {
rhashtable_remove_fast(&vg->vlan_hash,
&masterv->vnode, br_vlan_rht_params);
__vlan_del_list(masterv);
@ -573,7 +573,7 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
br_err(br, "failed insert local address into bridge forwarding table\n");
return ret;
}
atomic_inc(&vlan->refcnt);
refcount_inc(&vlan->refcnt);
vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
vg->num_vlans++;
}
@ -595,7 +595,7 @@ int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
vlan->br = br;
if (flags & BRIDGE_VLAN_INFO_BRENTRY)
atomic_set(&vlan->refcnt, 1);
refcount_set(&vlan->refcnt, 1);
ret = __vlan_add(vlan, flags);
if (ret) {
free_percpu(vlan->stats);