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drm/i915/overlay: Prevent divide by zero bugs in scaling

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commit 90a3d22ff02b196d5884e111f39271a1d4ee8e3e upstream.

Smatch detected a divide by zero bug in check_overlay_scaling().

    drivers/gpu/drm/i915/display/intel_overlay.c:976 check_overlay_scaling()
    error: potential divide by zero bug '/ rec->dst_height'.
    drivers/gpu/drm/i915/display/intel_overlay.c:980 check_overlay_scaling()
    error: potential divide by zero bug '/ rec->dst_width'.

Prevent this by ensuring that the dst height and width are non-zero.

Fixes: 02e792fbaadb ("drm/i915: implement drmmode overlay support v4")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220124122409.GA31673@kili
(cherry picked from commit cf5b64f7f10b28bebb9b7c9d25e7aee5cbe43918)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2022-01-24 15:24:09 +03:00 committed by Greg Kroah-Hartman
parent 9ea0185361
commit 3e69837551
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/display/intel_overlay.c
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@ -932,6 +932,9 @@ static int check_overlay_dst(struct intel_overlay *overlay,
const struct intel_crtc_state *pipe_config =
overlay->crtc->config;
if (rec->dst_height == 0 || rec->dst_width == 0)
return -EINVAL;
if (rec->dst_x < pipe_config->pipe_src_w &&
rec->dst_x + rec->dst_width <= pipe_config->pipe_src_w &&
rec->dst_y < pipe_config->pipe_src_h &&