linux-kernel - [PATCH 5.4 001/191] drm/mcde: dsi: Fix invalid pointer dereference if panel cannot be found

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Date:   Tue,  7 Jan 2020 21:52:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stephan Gerhold <stephan@...hold.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 001/191] drm/mcde: dsi: Fix invalid pointer dereference if panel cannot be found

From: Stephan Gerhold <stephan@...hold.net>

[ Upstream commit c131280c03bd1c225c2e64e9ef75873ffca3d96e ]

The "panel" pointer is not reset to NULL if of_drm_find_panel()
returns an error. Therefore we later assume that a panel was found,
and try to dereference the error pointer, resulting in:

    mcde-dsi a0351000.dsi: failed to find panel try bridge (4294966779)
    Unable to handle kernel paging request at virtual address fffffe03
    PC is at drm_panel_bridge_add.part.0+0x10/0x5c
    LR is at mcde_dsi_bind+0x120/0x464
    ...

Reset "panel" to NULL to avoid this problem.
Also change the format string of the error to %ld to print
the negative errors correctly. The crash above then becomes:

    mcde-dsi a0351000.dsi: failed to find panel try bridge (-517)
    mcde-dsi a0351000.dsi: no panel or bridge
    ...

Fixes: 5fc537bfd000 ("drm/mcde: Add new driver for ST-Ericsson MCDE")
Signed-off-by: Stephan Gerhold <stephan@...hold.net>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118130252.170324-1-stephan@gerhold.net
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/mcde/mcde_dsi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
index f9c9e32b299c..35bb825d1918 100644
--- a/drivers/gpu/drm/mcde/mcde_dsi.c
+++ b/drivers/gpu/drm/mcde/mcde_dsi.c
@@ -935,11 +935,13 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 	for_each_available_child_of_node(dev->of_node, child) {
 		panel = of_drm_find_panel(child);
 		if (IS_ERR(panel)) {
-			dev_err(dev, "failed to find panel try bridge (%lu)\n",
+			dev_err(dev, "failed to find panel try bridge (%ld)\n",
 				PTR_ERR(panel));
+			panel = NULL;
+
 			bridge = of_drm_find_bridge(child);
 			if (IS_ERR(bridge)) {
-				dev_err(dev, "failed to find bridge (%lu)\n",
+				dev_err(dev, "failed to find bridge (%ld)\n",
 					PTR_ERR(bridge));
 				return PTR_ERR(bridge);
 			}
-- 
2.20.1