linux-kernel - [PATCH] drm/nouveau/dispnv04: fix a possible null pointer dereference

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Message-Id: <20231007032349.3997387-1-make_ruc2021@163.com>
Date:   Sat,  7 Oct 2023 11:23:49 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     kherbst@...hat.com, lyude@...hat.com, dakr@...hat.com,
        airlied@...il.com, daniel@...ll.ch, noralf@...nnes.org,
        tzimmermann@...e.de, mripard@...nel.org, jani.nikula@...el.com,
        make_ruc2021@....com
Cc:     dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/nouveau/dispnv04: fix a possible null pointer dereference

In nv17_tv_get_ld_modes(), the return value of drm_mode_duplicate()
is assigned to mode, which will lead to a NULL pointer dereference
on failure of drm_mode_duplicate(). Add a check to avoid npd.

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 drivers/gpu/drm/nouveau/dispnv04/tvnv17.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
index 670c9739e5e1..4a08e61f3336 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
@@ -209,6 +209,8 @@ static int nv17_tv_get_ld_modes(struct drm_encoder *encoder,
 		struct drm_display_mode *mode;
 
 		mode = drm_mode_duplicate(encoder->dev, tv_mode);
+		if (!mode)
+			continue;
 
 		mode->clock = tv_norm->tv_enc_mode.vrefresh *
 			mode->htotal / 1000 *
-- 
2.37.2