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[ipoib] Fix a race when chain-loading undionly.kpxe in IPoIB

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The Infiniband link status change callback ipoib_link_state_changed()
may be called while the IPoIB device is closed, in which case there
will not be an IPoIB queue pair to be joined to the IPv4 broadcast
group.  This leads to NULL pointer dereferences in ib_mcast_attach()
and ib_mcast_detach().

Fix by not attempting to join (or leave) the broadcast group unless we
actually have an IPoIB queue pair.

Signed-off-by: Wissam Shoukair <wissams@mellanox.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Wissam Shoukair
2015-08-12 12:28:58 +03:00
committed by Michael Brown
parent fd18417cf1
commit eb8df9a046
3 changed files with 17 additions and 2 deletions
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7
src/drivers/net/ipoib.c
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@@ -791,7 +791,8 @@ static void ipoib_link_state_changed ( struct ib_device *ibdev ) {
int rc;
/* Leave existing broadcast group */
ipoib_leave_broadcast_group ( ipoib );
if ( ipoib->qp )
ipoib_leave_broadcast_group ( ipoib );
/* Update MAC address based on potentially-new GID prefix */
memcpy ( &ipoib->mac.gid.s.prefix, &ibdev->gid.s.prefix,
@@ -806,7 +807,7 @@ static void ipoib_link_state_changed ( struct ib_device *ibdev ) {
netdev_link_err ( netdev, ( rc ? rc : -EINPROGRESS_JOINING ) );
/* Join new broadcast group */
if ( ib_is_open ( ibdev ) && ib_link_ok ( ibdev ) &&
if ( ib_is_open ( ibdev ) && ib_link_ok ( ibdev ) && ipoib->qp &&
( ( rc = ipoib_join_broadcast_group ( ipoib ) ) != 0 ) ) {
DBGC ( ipoib, "IPoIB %p could not rejoin broadcast group: "
"%s\n", ipoib, strerror ( rc ) );
@@ -894,7 +895,9 @@ static void ipoib_close ( struct net_device *netdev ) {
/* Tear down the queues */
ib_destroy_qp ( ibdev, ipoib->qp );
ipoib->qp = NULL;
ib_destroy_cq ( ibdev, ipoib->cq );
ipoib->cq = NULL;
/* Close IB device */
ib_close ( ibdev );