linux-kernel - [ 12/72] ARM: 7326/2: PL330: fix null pointer dereference in pl330_chan

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Date:	Mon, 27 Feb 2012 17:04:41 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mans Rullgard <mans.rullgard@...aro.org>,
	Javi Merino <javi.merino@....com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [ 12/72] ARM: 7326/2: PL330: fix null pointer dereference in pl330_chan_ctrl()

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

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

From: Javi Merino <javi.merino@....com>

commit 46e33c606af8e0caeeca374103189663d877c0d6 upstream.

This fixes the thrd->req_running field being accessed before thrd
is checked for null. The error was introduced in

   abb959f: ARM: 7237/1: PL330: Fix driver freeze

Reference: <1326458191-23492-1-git-send-email-mans.rullgard@...aro.org>

Signed-off-by: Mans Rullgard <mans.rullgard@...aro.org>
Acked-by: Javi Merino <javi.merino@....com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/common/pl330.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/arm/common/pl330.c
+++ b/arch/arm/common/pl330.c
@@ -1496,12 +1496,13 @@ int pl330_chan_ctrl(void *ch_id, enum pl
 	struct pl330_thread *thrd = ch_id;
 	struct pl330_dmac *pl330;
 	unsigned long flags;
-	int ret = 0, active = thrd->req_running;
+	int ret = 0, active;
 
 	if (!thrd || thrd->free || thrd->dmac->state == DYING)
 		return -EINVAL;
 
 	pl330 = thrd->dmac;
+	active = thrd->req_running;
 
 	spin_lock_irqsave(&pl330->lock, flags);
 


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