3.11.10.14 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Zhaowei Yuan <zhaowei.yuan@xxxxxxxxxxx>
commit 1539fb9bd405ee32282ea0a38404f9e008ac5b7a upstream.
If user uses wrong ioctl command with _IOC_NONE and argument size
greater than 0, it can cause NULL pointer access from memset of line
463. If _IOC_NONE, don't memset to 0 for kdata.
Signed-off-by: Zhaowei Yuan <zhaowei.yuan@xxxxxxxxxxx>
Reviewed-by: David Herrmann <dh.herrmann@xxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_drv.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
mode change 100644 => 100755 drivers/gpu/drm/drm_drv.c
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
old mode 100644
new mode 100755
index 6dd71735cab4..d71e1a46c4d4
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -460,8 +460,9 @@ long drm_ioctl(struct file *filp,
retcode = -EFAULT;
goto err_i1;
}
- } else
+ } else if (cmd & IOC_OUT) {
memset(kdata, 0, usize);
+ }
if (ioctl->flags & DRM_UNLOCKED)
retcode = func(dev, kdata, file_priv);
--
1.9.1
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