Quoting Ville Syrjala (2018-09-20 20:10:18)
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Let's try to make sure the fb offset computations never hit
> an integer overflow by making sure the entire fb stays
> below 32bits. framebuffer_check() in the core already does
> the same check, but as it doesn't know about tiling some things
> can slip through. Repeat the check in the driver with tiling
> taken into account.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 18 +++++++++++++++++-
> 1 file changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index e642b7717106..67259c719ffe 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2400,10 +2400,26 @@ static int intel_fb_offset_to_xy(int *x, int *y,
> int color_plane)
> {
> struct drm_i915_private *dev_priv = to_i915(fb->dev);
> + unsigned int height;
>
> if (fb->modifier != DRM_FORMAT_MOD_LINEAR &&
> - fb->offsets[color_plane] % intel_tile_size(dev_priv))
> + fb->offsets[color_plane] % intel_tile_size(dev_priv)) {
> + DRM_DEBUG_KMS("Misaligned offset 0x%08x for color plane %d\n",
> + fb->offsets[color_plane], color_plane);
> return -EINVAL;
> + }
> +
> + height = drm_framebuffer_plane_height(fb->height, fb, color_plane);
> + height = ALIGN(height, intel_tile_height(fb, color_plane));
> +
> + /* Catch potential overflows early */
> + if (mul_u32_u32(height, fb->pitches[color_plane]) +
if (add_overflows(mul_u32_u32(height, fb->pitches[color_plane]),
fb->offsets[color_plane],
U32_MAX) {
?
> + fb->offsets[color_plane] > UINT_MAX) {
> + DRM_DEBUG_KMS("Bad offset 0x%08x or pitch %d for color plane %d\n",
> + fb->offsets[color_plane], fb->pitches[color_plane],
> + color_plane);
> + return -ERANGE;
> + }
>
> *x = 0;
> *y = 0;
> --
> 2.16.4
>
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