linux-kernel - [PATCH] drm/radeon: fix a possible null pointer dereference

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Date:   Wed, 11 Oct 2023 09:21:43 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Ma Ke <make_ruc2021@....com>
Subject: [PATCH] drm/radeon: fix a possible null pointer dereference

In radeon_tv_get_modes(), the return value of drm_cvt_mode()
is assigned to mode, which will lead to a NULL pointer
dereference on failure of drm_cvt_mode(). Add a check to
avoid null point dereference.

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 drivers/gpu/drm/radeon/radeon_connectors.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index d2f02c3dfce2..b84b58926106 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -1119,6 +1119,8 @@ static int radeon_tv_get_modes(struct drm_connector *connector)
 	else {
 		/* only 800x600 is supported right now on pre-avivo chips */
 		tv_mode = drm_cvt_mode(dev, 800, 600, 60, false, false, false);
+		if (!tv_mode)
+			return 0;
 		tv_mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 		drm_mode_probed_add(connector, tv_mode);
 	}
-- 
2.37.2