Commit bc1562f9 authored by Doron Tsur's avatar Doron Tsur Committed by Greg Kroah-Hartman

IB/cm: Fix rb-tree duplicate free and use-after-free

commit 0ca81a28 upstream.

ib_send_cm_sidr_rep could sometimes erase the node from the sidr
(depending on errors in the process). Since ib_send_cm_sidr_rep is
called both from cm_sidr_req_handler and cm_destroy_id, cm_id_priv
could be either erased from the rb_tree twice or not erased at all.
Fixing that by making sure it's erased only once before freeing
cm_id_priv.

Fixes: a977049d ('[PATCH] IB: Add the kernel CM implementation')
Signed-off-by: default avatarDoron Tsur <doront@mellanox.com>
Signed-off-by: default avatarMatan Barak <matanb@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 39caa731
......@@ -873,6 +873,11 @@ static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
case IB_CM_SIDR_REQ_RCVD:
spin_unlock_irq(&cm_id_priv->lock);
cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
spin_lock_irq(&cm.lock);
if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
rb_erase(&cm_id_priv->sidr_id_node,
&cm.remote_sidr_table);
spin_unlock_irq(&cm.lock);
break;
case IB_CM_REQ_SENT:
case IB_CM_MRA_REQ_RCVD:
......@@ -3112,7 +3117,10 @@ int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
spin_lock_irqsave(&cm.lock, flags);
rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
}
spin_unlock_irqrestore(&cm.lock, flags);
return 0;
......
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