ACK: [PATCH] drm: fix NULL pointer access by wrong ioctl
Stefan Bader
stefan.bader at canonical.com
Wed Nov 7 15:27:15 UTC 2018
On 07.11.18 16:18, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
>
> BugLink: https://bugs.launchpad.net/bugs/1797546
>
> 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 at samsung.com>
> Reviewed-by: David Herrmann <dh.herrmann at gmail.com>
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> (backported from commit 1539fb9bd405ee32282ea0a38404f9e008ac5b7a)
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---
> drivers/gpu/drm/drm_drv.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index d9137e4..ef65779 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -383,8 +383,9 @@ 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);
>
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