From 33ba0fa9f315ce32fbb86fa671c131f5355b52a1 Mon Sep 17 00:00:00 2001
From: Krishna Kumar <krkumar2@in.ibm.com>
Date: Thu, 9 Nov 2006 09:30:34 +0530
Subject: RDMA/iwcm: Fix memory corruption bug in cm_work_handler()
Possible memory corruption scenario: after putting the work entry back
on the work_free_list, we call process_event() which dereferences
work->event, which could have been modified to another value
meanwhile.
Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
---
drivers/infiniband/core/iwcm.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
(limited to 'drivers')
diff --git a/drivers/infiniband/core/iwcm.c b/drivers/infiniband/core/iwcm.c
index 2bbcfa5c6e2..22d498c9a68 100644
--- a/drivers/infiniband/core/iwcm.c
+++ b/drivers/infiniband/core/iwcm.c
@@ -829,7 +829,8 @@ static int process_event(struct iwcm_id_private *cm_id_priv,
*/
static void cm_work_handler(void *arg)
{
- struct iwcm_work *work = arg, lwork;
+ struct iwcm_work *work = arg;
+ struct iw_cm_event levent;
struct iwcm_id_private *cm_id_priv = work->cm_id;
unsigned long flags;
int empty;
@@ -842,11 +843,11 @@ static void cm_work_handler(void *arg)
struct iwcm_work, list);
list_del_init(&work->list);
empty = list_empty(&cm_id_priv->work_list);
- lwork = *work;
+ levent = work->event;
put_work(work);
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
- ret = process_event(cm_id_priv, &work->event);
+ ret = process_event(cm_id_priv, &levent);
if (ret) {
set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags);
destroy_cm_id(&cm_id_priv->id);
--
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