Commit 433480c1 authored by Ville Syrjälä's avatar Ville Syrjälä

drm/rect: Avoid division by zero

Check for zero width/height destination rectangle in
drm_rect_clip_scaled() to avoid a division by zero.

Cc: stable@vger.kernel.org
Fixes: f96bdf56 ("drm/rect: Handle rounding errors in drm_rect_clip_scaled, v3.")
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Benjamin Gaignard <benjamin.gaignard@st.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Testcase: igt/kms_selftest/drm_rect_clip_scaled_div_by_zero
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191122175623.13565-2-ville.syrjala@linux.intel.comReviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarBenjamin Gaignard <benjamin.gaignard@st.com>
parent 96227287
......@@ -54,7 +54,12 @@ EXPORT_SYMBOL(drm_rect_intersect);
static u32 clip_scaled(u32 src, u32 dst, u32 clip)
{
u64 tmp = mul_u32_u32(src, dst - clip);
u64 tmp;
if (dst == 0)
return 0;
tmp = mul_u32_u32(src, dst - clip);
/*
* Round toward 1.0 when clipping so that we don't accidentally
......
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