linux-kernel - [PATCH 5.10 68/95] drm: mxsfb: Fix NULL pointer dereference crash on unload

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Date:   Mon, 25 Oct 2021 21:15:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marek Vasut <marex@...x.de>,
        Daniel Abrecht <public@...ielabrecht.ch>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Stefan Agner <stefan@...er.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Subject: [PATCH 5.10 68/95] drm: mxsfb: Fix NULL pointer dereference crash on unload

From: Marek Vasut <marex@...x.de>

commit 3cfc183052c3dbf8eae57b6c1685dab00ed3db4a upstream.

The mxsfb->crtc.funcs may already be NULL when unloading the driver,
in which case calling mxsfb_irq_disable() via drm_irq_uninstall() from
mxsfb_unload() leads to NULL pointer dereference.

Since all we care about is masking the IRQ and mxsfb->base is still
valid, just use that to clear and mask the IRQ.

Fixes: ae1ed00932819 ("drm: mxsfb: Stop using DRM simple display pipeline helper")
Signed-off-by: Marek Vasut <marex@...x.de>
Cc: Daniel Abrecht <public@...ielabrecht.ch>
Cc: Emil Velikov <emil.l.velikov@...il.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Stefan Agner <stefan@...er.ch>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211016210446.171616-1-marex@denx.de
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -268,7 +268,11 @@ static void mxsfb_irq_disable(struct drm
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
 
 	mxsfb_enable_axi_clk(mxsfb);
-	mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc);
+
+	/* Disable and clear VBLANK IRQ */
+	writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
+	writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
+
 	mxsfb_disable_axi_clk(mxsfb);
 }