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32 lines
1.0 KiB
Diff
32 lines
1.0 KiB
Diff
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From 1e53604087930e7cf42eee3d42572d0d6f54c86a Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Tue, 7 May 2024 11:44:49 +0100
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Subject: [PATCH 1084/1085] drm/vc4: Fix potential null pointer read when
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disabling vblank
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vc4_disable_vblank assumed that vc4_encoder was always assigned,
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which isn't guaranteed.
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If it isn't assigned then disable the interrupt anyway as it's
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not connected.
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https://github.com/raspberrypi/linux/issues/6146
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Fixes: 63c0bcc4b747 ("drm/vc4: Add option to call from crtc to encoder on vblank")
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/gpu/drm/vc4/vc4_crtc.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/gpu/drm/vc4/vc4_crtc.c
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+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
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@@ -834,7 +834,7 @@ static void vc4_disable_vblank(struct dr
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if (!drm_dev_enter(dev, &idx))
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return;
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- if (vc4_encoder->type != VC4_ENCODER_TYPE_DSI0)
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+ if (!vc4_encoder || vc4_encoder->type != VC4_ENCODER_TYPE_DSI0)
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CRTC_WRITE(PV_INTEN, 0);
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drm_dev_exit(idx);
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