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drm: mxsfb: Fix NULL pointer dereference
mxsfb should not ever dereference the NULL pointer which
drm_atomic_get_new_bridge_state is allowed to return.
Assume a fixed format instead.
Fixes: b776b0f00f
("drm: mxsfb: Use bus_format from the nearest bridge if present")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220202081755.145716-3-alexander.stein@ew.tq-group.com
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1 changed files with 5 additions and 1 deletions
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@ -361,7 +361,11 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
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bridge_state =
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drm_atomic_get_new_bridge_state(state,
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mxsfb->bridge);
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bus_format = bridge_state->input_bus_cfg.format;
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if (!bridge_state)
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bus_format = MEDIA_BUS_FMT_FIXED;
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else
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bus_format = bridge_state->input_bus_cfg.format;
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if (bus_format == MEDIA_BUS_FMT_FIXED) {
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dev_warn_once(drm->dev,
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"Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
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