CVE-2016-5728

commit 9bf292bfca94694a721449e3fd752493856710f6
Author: Ashutosh Dixit <ashutosh.dixit@intel.com>
Date:   Wed Apr 27 14:36:05 2016 -0700

    misc: mic: Fix for double fetch security bug in VOP driver
    
    The MIC VOP driver does two successive reads from user space to read a
    variable length data structure. Kernel memory corruption can result if
    the data structure changes between the two reads. This patch disallows
    the chance of this happening.
    
    Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=116651
    Reported by: Pengfei Wang <wpengfeinudt@gmail.com>
    Reviewed-by: Sudeep Dutt <sudeep.dutt@intel.com>
    Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
    Cc: stable <stable@vger.kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c
index e94c7fb..88e4523 100644
--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -945,6 +945,11 @@ static long vop_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
                        ret = -EFAULT;
                        goto free_ret;
                }
+               /* Ensure desc has not changed between the two reads */
+               if (memcmp(&dd, dd_config, sizeof(dd))) {
+                       ret = -EINVAL;
+                       goto free_ret;
+               }
                mutex_lock(&vdev->vdev_mutex);
                mutex_lock(&vi->vop_mutex);
                ret = vop_virtio_add_device(vdev, dd_config);


References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5728
http://www.cvedetails.com/cve/CVE-2016-5728/