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IB/core: Fix use after free of ifa

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When using ifup/ifdown while executing enum_netdev_ipv4_ips,
ifa could become invalid and cause use after free error.
Fixing it by protecting with RCU lock.

Fixes: 03db3a2d81 ('IB/core: Add RoCE GID table management')
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Matan Barak 2015-10-15 15:01:03 +03:00 committed by Doug Ledford
parent 17b38fb890
commit 3909642034
1 changed files with 27 additions and 8 deletions
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35
drivers/infiniband/core/roce_gid_mgmt.c
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@ -250,25 +250,44 @@ static void enum_netdev_ipv4_ips(struct ib_device *ib_dev,
u8 port, struct net_device *ndev)
{
struct in_device *in_dev;
struct sin_list {
struct list_head list;
struct sockaddr_in ip;
};
struct sin_list *sin_iter;
struct sin_list *sin_temp;
LIST_HEAD(sin_list);
if (ndev->reg_state >= NETREG_UNREGISTERING)
return;
in_dev = in_dev_get(ndev);
if (!in_dev)
rcu_read_lock();
in_dev = __in_dev_get_rcu(ndev);
if (!in_dev) {
rcu_read_unlock();
return;
}
for_ifa(in_dev) {
struct sockaddr_in ip;
struct sin_list *entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
ip.sin_family = AF_INET;
ip.sin_addr.s_addr = ifa->ifa_address;
update_gid_ip(GID_ADD, ib_dev, port, ndev,
(struct sockaddr *)&ip);
if (!entry) {
pr_warn("roce_gid_mgmt: couldn't allocate entry for IPv4 update\n");
continue;
}
entry->ip.sin_family = AF_INET;
entry->ip.sin_addr.s_addr = ifa->ifa_address;
list_add_tail(&entry->list, &sin_list);
}
endfor_ifa(in_dev);
rcu_read_unlock();
in_dev_put(in_dev);
list_for_each_entry_safe(sin_iter, sin_temp, &sin_list, list) {
update_gid_ip(GID_ADD, ib_dev, port, ndev,
(struct sockaddr *)&sin_iter->ip);
list_del(&sin_iter->list);
kfree(sin_iter);
}
}
static void enum_netdev_ipv6_ips(struct ib_device *ib_dev,