linux-kernel - [PATCH][next] drm/panel: fix null pointer dereference on pointer mode

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Date:   Fri, 18 Sep 2020 16:51:36 +0100
From:   Colin King <colin.king@...onical.com>
To:     Guido Günther <agx@...xcpu.org>,
        Purism Kernel Team <kernel@...i.sm>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org
Subject: [PATCH][next] drm/panel: fix null pointer dereference on pointer mode

From: Colin Ian King <colin.king@...onical.com>

Currently a null pointer check on pointer mode is passing mode to
function drm_mode_vrefresh and this causes a null pointer dereference
on mode.  Fix this by not calling drm_mode_vrefresh since the call
is only required for error reporting.

Addresses-Coverity: ("Dereference after null check")
Fixes: 72967d5616d3 ("drm/panel: Add panel driver for the Mantix MLAF057WE51-X DSI panel")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
index 3482e28e30fc..be4761a643f9 100644
--- a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
+++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
@@ -202,9 +202,8 @@ static int mantix_get_modes(struct drm_panel *panel,
 
 	mode = drm_mode_duplicate(connector->dev, &default_mode);
 	if (!mode) {
-		dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
-			default_mode.hdisplay, default_mode.vdisplay,
-			drm_mode_vrefresh(mode));
+		dev_err(ctx->dev, "Failed to add mode %ux%u\n",
+			default_mode.hdisplay, default_mode.vdisplay);
 		return -ENOMEM;
 	}
 
-- 
2.27.0