lkml.org 
[lkml]   [2014]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3.11 030/128] drm: fix NULL pointer access by wrong ioctl
Date
3.11.10.14 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhaowei Yuan <zhaowei.yuan@samsung.com>

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@samsung.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
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


\
 
 \ /
  Last update: 2014-07-24 12:41    [W:0.524 / U:9.644 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site