linux-kernel - [PATCH 4.9 55/66] IB/rxe: Prevent from completer to operate on non valid QP

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Date:   Tue, 31 Jan 2017 06:36:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yonatan Cohen <yonatanc@...lanox.com>,
        Moni Shoua <monis@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>
Subject: [PATCH 4.9 55/66] IB/rxe: Prevent from completer to operate on non valid QP

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yonatan Cohen <yonatanc@...lanox.com>

commit 2d4b21e0a2913612274a69a3ba1bfee4cffc6e77 upstream.

On UD QP completer tasklet is scheduled for each packet sent.

If it is followed by a destroy_qp(), the kernel panic will
happen as the completer tries to operate on a destroyed QP.

Fixes: 8700e3e7c485 ("Soft RoCE driver")
Signed-off-by: Yonatan Cohen <yonatanc@...lanox.com>
Reviewed-by: Moni Shoua <monis@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/sw/rxe/rxe_qp.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/infiniband/sw/rxe/rxe_qp.c
+++ b/drivers/infiniband/sw/rxe/rxe_qp.c
@@ -813,8 +813,7 @@ void rxe_qp_destroy(struct rxe_qp *qp)
 	del_timer_sync(&qp->rnr_nak_timer);
 
 	rxe_cleanup_task(&qp->req.task);
-	if (qp_type(qp) == IB_QPT_RC)
-		rxe_cleanup_task(&qp->comp.task);
+	rxe_cleanup_task(&qp->comp.task);
 
 	/* flush out any receive wr's or pending requests */
 	__rxe_do_task(&qp->req.task);