drm: drm_ioctl() should zero-init extra data

If an older userspace passes in a smaller arg than the current kernel
ioctl arg struct, then extra fields should be initialized to zero
rather than passing random data to the DRM driver.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Rob Clark 2011-09-18 14:38:15 -05:00 committed by Dave Airlie
parent 017ed8012e
commit dd2351da7c

View file

@ -438,6 +438,8 @@ long drm_ioctl(struct file *filp,
goto err_i1;
}
}
if (asize > usize)
memset(kdata + usize, 0, asize - usize);
}
if (cmd & IOC_IN) {