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drm/tegra: Fix window[0] base address corruption

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Window uses shared stride for UV planes and tegra_dc_window struct
defines array of 2 strides per window. That's not taken in account
during setting up of the window addresses and strides, resulting in
out-of-bounds write of the 3-rd (non-existent) V plane stride that
overwrites Y plane base address.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[treding@nvidia.com: explain why the V-plane stride is ignored]
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2016-08-21 11:57:58 +03:00 committed by Thierry Reding
parent 87904c3e82
commit 08ee01789e
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/tegra/dc.c
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@ -591,7 +591,14 @@ static void tegra_plane_atomic_update(struct drm_plane *plane,
struct tegra_bo *bo = tegra_fb_get_plane(fb, i);
window.base[i] = bo->paddr + fb->offsets[i];
window.stride[i] = fb->pitches[i];
/*
* Tegra uses a shared stride for UV planes. Framebuffers are
* already checked for this in the tegra_plane_atomic_check()
* function, so it's safe to ignore the V-plane pitch here.
*/
if (i < 2)
window.stride[i] = fb->pitches[i];
}
tegra_dc_setup_window(dc, p->index, &window);