Commit 46e33c60 authored Feb 15, 2012 by Javi Merino Committed by Russell King Feb 15, 2012

ARM: 7326/2: PL330: fix null pointer dereference in pl330_chan_ctrl()



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

   abb959f8: ARM: 7237/1: PL330: Fix driver freeze

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

Cc: stable@kernel.org
Signed-off-by: Mans Rullgard <mans.rullgard@linaro.org>
Acked-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 4272f98a

arch/arm/common/pl330.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1502,12 +1502,13 @@ int pl330_chan_ctrl(void *ch_id, enum pl330_chan_op op)
		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);