linux-kernel - [PATCH 3/6] gpu: host1x: Fix memory access in syncpt request

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Date:	Fri, 17 May 2013 14:49:45 +0300
From:	Arto Merilainen <amerilainen@...dia.com>
To:	<thierry.reding@...onic-design.de>, <airlied@...ux.ie>,
	<linux-tegra@...r.kernel.org>
CC:	<tbergstrom@...dia.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>,
	Arto Merilainen <amerilainen@...dia.com>
Subject: [PATCH 3/6] gpu: host1x: Fix memory access in syncpt request

This patch fixes a bad memory access in syncpoint request code. If
no syncpoints were available, the code accessed unreserved memory
area causing unexpected behaviour.

Signed-off-by: Arto Merilainen <amerilainen@...dia.com>
---
 drivers/gpu/host1x/syncpt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/host1x/syncpt.c b/drivers/gpu/host1x/syncpt.c
index 5bf5366..6b7ee88 100644
--- a/drivers/gpu/host1x/syncpt.c
+++ b/drivers/gpu/host1x/syncpt.c
@@ -40,7 +40,7 @@ static struct host1x_syncpt *_host1x_syncpt_alloc(struct host1x *host,
 
 	for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++)
 		;
-	if (sp->dev)
+	if (i >= host->info->nb_pts)
 		return NULL;
 
 	name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id,
-- 
1.7.9.5

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