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RDMA/siw: Fix IPv6 addr_list locking

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Walking the address list of an inet6_dev requires
appropriate locking. Since the called function
siw_listen_address() may sleep, we have to use
rtnl_lock() instead of read_lock_bh().

Also introduces sanity checks if we got a device
from in_dev_get() or in6_dev_get().

Reported-by: Bart Van Assche <bvanassche@acm.org>
Fixes: 6c52fdc244 ("rdma/siw: connection management")
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Link: https://lore.kernel.org/r/20190828130355.22830-1-bmt@zurich.ibm.com
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bernard Metzler 2019-08-28 15:03:55 +02:00 committed by Doug Ledford
parent c536277e0d
commit 531a64e4c3
1 changed files with 20 additions and 11 deletions
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31
drivers/infiniband/sw/siw/siw_cm.c
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@ -1962,6 +1962,10 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
struct sockaddr_in s_laddr, *s_raddr;
const struct in_ifaddr *ifa;
if (!in_dev) {
rv = -ENODEV;
goto out;
}
memcpy(&s_laddr, &id->local_addr, sizeof(s_laddr));
s_raddr = (struct sockaddr_in *)&id->remote_addr;
@ -1991,22 +1995,27 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
struct sockaddr_in6 *s_laddr = &to_sockaddr_in6(id->local_addr),
*s_raddr = &to_sockaddr_in6(id->remote_addr);
if (!in6_dev) {
rv = -ENODEV;
goto out;
}
siw_dbg(id->device,
"laddr %pI6:%d, raddr %pI6:%d\n",
&s_laddr->sin6_addr, ntohs(s_laddr->sin6_port),
&s_raddr->sin6_addr, ntohs(s_raddr->sin6_port));
read_lock_bh(&in6_dev->lock);
rtnl_lock();
list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
struct sockaddr_in6 bind_addr;
if (ifp->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED))
continue;
if (ipv6_addr_any(&s_laddr->sin6_addr) ||
ipv6_addr_equal(&s_laddr->sin6_addr, &ifp->addr)) {
bind_addr.sin6_family = AF_INET6;
bind_addr.sin6_port = s_laddr->sin6_port;
bind_addr.sin6_flowinfo = 0;
bind_addr.sin6_addr = ifp->addr;
bind_addr.sin6_scope_id = dev->ifindex;
struct sockaddr_in6 bind_addr = {
.sin6_family = AF_INET6,
.sin6_port = s_laddr->sin6_port,
.sin6_flowinfo = 0,
.sin6_addr = ifp->addr,
.sin6_scope_id = dev->ifindex };
rv = siw_listen_address(id, backlog,
(struct sockaddr *)&bind_addr,
@ -2015,12 +2024,12 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
listeners++;
}
}
read_unlock_bh(&in6_dev->lock);
rtnl_unlock();
in6_dev_put(in6_dev);
} else {
return -EAFNOSUPPORT;
rv = -EAFNOSUPPORT;
}
out:
if (listeners)
rv = 0;
else if (!rv)