linux-kernel - [PATCH] drm: do not use device name as a format string

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Date:	Wed, 18 Nov 2015 18:58:18 +0100
From:	Nicolas Iooss <nicolas.iooss_linux@....org>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	David Airlie <airlied@...ux.ie>,
	Jianwei Wang <jianwei.wang.chn@...il.com>,
	Alison Wang <alison.wang@...escale.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Terje Bergström <tbergstrom@...dia.com>,
	dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Nicolas Iooss <nicolas.iooss_linux@....org>
Subject: [PATCH] drm: do not use device name as a format string

drm_dev_set_unique() formats its parameter using kvasprintf() but many
of its callers directly pass dev_name(dev) as printf format string,
without any format parameter.  This can cause some issues when the
device name contains '%' characters.

To avoid any potential issue, always use "%s" when using
drm_dev_set_unique() with dev_name().

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>
---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 2 +-
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c    | 2 +-
 drivers/gpu/drm/tegra/drm.c                  | 2 +-
 drivers/gpu/drm/vc4/vc4_drv.c                | 2 +-
 include/drm/drmP.h                           | 1 +
 5 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index 244df0a440b7..0d720d3a7ee0 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -733,7 +733,7 @@ static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
 	if (!ddev)
 		return -ENOMEM;
 
-	ret = drm_dev_set_unique(ddev, dev_name(ddev->dev));
+	ret = drm_dev_set_unique(ddev, "%s", dev_name(ddev->dev));
 	if (ret)
 		goto err_unref;
 
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 1930234ba5f1..947d75f59881 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -363,7 +363,7 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
 	fsl_dev->np = dev->of_node;
 	drm->dev_private = fsl_dev;
 	dev_set_drvdata(dev, fsl_dev);
-	drm_dev_set_unique(drm, dev_name(dev));
+	drm_dev_set_unique(drm, "%s", dev_name(dev));
 
 	ret = drm_dev_register(drm, 0);
 	if (ret < 0)
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 159ef515cab1..b278f60f4376 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -991,7 +991,7 @@ static int host1x_drm_probe(struct host1x_device *dev)
 	if (!drm)
 		return -ENOMEM;
 
-	drm_dev_set_unique(drm, dev_name(&dev->dev));
+	drm_dev_set_unique(drm, "%s", dev_name(&dev->dev));
 	dev_set_drvdata(&dev->dev, drm);
 
 	err = drm_dev_register(drm, 0);
diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 6e730605edcc..c90a451aaa79 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -168,7 +168,7 @@ static int vc4_drm_bind(struct device *dev)
 	vc4->dev = drm;
 	drm->dev_private = vc4;
 
-	drm_dev_set_unique(drm, dev_name(dev));
+	drm_dev_set_unique(drm, "%s", dev_name(dev));
 
 	drm_mode_config_init(drm);
 	if (ret)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 0b921ae06cd8..995fb96cb740 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1049,6 +1049,7 @@ void drm_dev_ref(struct drm_device *dev);
 void drm_dev_unref(struct drm_device *dev);
 int drm_dev_register(struct drm_device *dev, unsigned long flags);
 void drm_dev_unregister(struct drm_device *dev);
+__printf(2, 3)
 int drm_dev_set_unique(struct drm_device *dev, const char *fmt, ...);
 
 struct drm_minor *drm_minor_acquire(unsigned int minor_id);
-- 
2.6.2

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