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RDMA/iwcm: Don't access a cm_id after dropping reference 

cm_work_handler() can access cm_id_priv after it drops its reference
by calling iwch_deref_id(), which might cause it to be freed.  The fix
is to look at whether IWCM_F_CALLBACK_DESTROY is set _before_ dropping
the reference.  Then if it was set, free the cm_id on this thread.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Steve Wise 2008-03-04 16:44:52 -06:00 committed by Roland Dreier
parent d33ed425c6
commit d7c1fbd660
1 changed files with 3 additions and 2 deletions
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5
drivers/infiniband/core/iwcm.c
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@ -839,6 +839,7 @@ static void cm_work_handler(struct work_struct *_work)
unsigned long flags;
int empty;
int ret = 0;
int destroy_id;
spin_lock_irqsave(&cm_id_priv->lock, flags);
empty = list_empty(&cm_id_priv->work_list);
@ -857,9 +858,9 @@ static void cm_work_handler(struct work_struct *_work)
destroy_cm_id(&cm_id_priv->id);
}
BUG_ON(atomic_read(&cm_id_priv->refcount)==0);
destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
if (iwcm_deref_id(cm_id_priv)) {
if (test_bit(IWCM_F_CALLBACK_DESTROY,
&cm_id_priv->flags)) {
if (destroy_id) {
BUG_ON(!list_empty(&cm_id_priv->work_list));
free_cm_id(cm_id_priv);
}