linux-kernel - [PATCH] drm/sti: avoid potential dereference of error pointers

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Date:   Wed, 20 Sep 2023 11:21:59 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     alain.volmat@...s.st.com, airlied@...il.com
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Ma Ke <make_ruc2021@....com>
Subject: [PATCH] drm/sti: avoid potential dereference of error pointers

The return value of drm_atomic_get_crtc_state() needs to be
checked. To avoid use of error pointer 'crtc_state' in case
of the failure.

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

diff --git a/drivers/gpu/drm/sti/sti_cursor.c b/drivers/gpu/drm/sti/sti_cursor.c
index db0a1eb53532..e460f5ba2d87 100644
--- a/drivers/gpu/drm/sti/sti_cursor.c
+++ b/drivers/gpu/drm/sti/sti_cursor.c
@@ -200,6 +200,8 @@ static int sti_cursor_atomic_check(struct drm_plane *drm_plane,
 		return 0;
 
 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
 	mode = &crtc_state->mode;
 	dst_x = new_plane_state->crtc_x;
 	dst_y = new_plane_state->crtc_y;
-- 
2.37.2