> A recent cleanup introduced a potential dereference of -EFAULT when we
> call kfree(map->menu_info).
>
> Fixes: 4cc5bed1caeb ("[media] uvcvideo: Use memdup_user() rather than
> duplicating its implementation")
> Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Thanks for your information.
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c
> b/drivers/media/usb/uvc/uvc_v4l2.c
> index a7e12fd..3e7e283 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -66,14 +66,14 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain
> *chain,
> if (xmap->menu_count == 0 ||
> xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) {
> ret = -EINVAL;
> - goto done;
> + goto free_map;
> }
>
> size = xmap->menu_count * sizeof(*map->menu_info);
> map->menu_info = memdup_user(xmap->menu_info, size);
> if (IS_ERR(map->menu_info)) {
> ret = PTR_ERR(map->menu_info);
> - goto done;
> + goto free_map;
> }
>
> map->menu_count = xmap->menu_count;
> @@ -83,13 +83,13 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain
> *chain,
> uvc_trace(UVC_TRACE_CONTROL, "Unsupported V4L2 control type "
> "%u.\n", xmap->v4l2_type);
> ret = -ENOTTY;
> - goto done;
> + goto free_map;
> }
>
> ret = uvc_ctrl_add_mapping(chain, map);
>
> -done:
> kfree(map->menu_info);
> +free_map:
> kfree(map);
>
> return ret;
>
Did your update suggestion become also relevant just because the corresponding
update step “[PATCH 2/2] uvc_v4l2: One function call less in
uvc_ioctl_ctrl_map()
after error detection” which I offered as another change possibility on
2016-08-19
was rejected on 2016-11-22?
https://patchwork.linuxtv.org/patch/36528/
https://patchwork.kernel.org/patch/9289897/
https://lkml.kernel.org/r/<8f89ec37-1556-4c09-f0b7-df87b4169...@users.sourceforge.net>
Regards,
Markus
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