[PATCH] drm: check return values in drm_version

[Andres Salomon]

In drm_version, actually check the results from function calls so that
we're not potentially passing garbage back to userspace.

Signed-off-by: Andres Salomon <dilinger@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_drv.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index ec0e3ae..5bd3f94 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -403,15 +403,21 @@ static int drm_version(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv)
 {
 	struct drm_version *version = data;
+	int err;
 
 	version->version_major = dev->driver->major;
 	version->version_minor = dev->driver->minor;
 	version->version_patchlevel = dev->driver->patchlevel;
-	drm_copy_field(version->name, &version->name_len, dev->driver->name);
-	drm_copy_field(version->date, &version->date_len, dev->driver->date);
-	drm_copy_field(version->desc, &version->desc_len, dev->driver->desc);
-
-	return 0;
+	err = drm_copy_field(version->name, &version->name_len,
+			dev->driver->name);
+	if (!err)
+		err = drm_copy_field(version->date, &version->date_len,
+				dev->driver->date);
+	if (!err)
+		err = drm_copy_field(version->desc, &version->desc_len,
+				dev->driver->desc);
+
+	return err;
 }
 
 /**
-- 
1.5.6.5

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