[PATCH] drm/amdgpu: fix out of bounds write

[Alex Deucher]

On Wed, Oct 13, 2021 at 4:04 PM T. Williams <tdwilliamsiv at gmail.com> wrote:
>

The description and s-o-b should go here and the patch seems to be
mangled.  I've manually applied this.  Please fix up your mailer in
the future.

Thanks for the fix.

Alex


> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> index 87daa78a32b8..17f2756a64dc 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> @@ -263,7 +263,7 @@ static ssize_t dp_link_settings_write(struct file *f, const char __user *buf,
>         if (!wr_buf)
>                 return -ENOSPC;
>
> -       if (parse_write_buffer_into_params(wr_buf, size,
> +       if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
>                                            (long *)param, buf,
>                                            max_param_num,
>                                            &param_nums)) {
> --
>
> Size can be any value and is user controlled resulting in overwriting the 40 byte array wr_buf with an arbitrary length of data from buf.
>
> Signed-off-by: Thelford Williams <tdwilliamsiv at gmail.com>