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Subject[PATCH] drm: do not use device name as a format string
Date
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@m4x.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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