linux-kernel - [PATCH 4.19 018/639] drm/sti: do not remove the drm

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Date:   Fri, 24 Jan 2020 10:23:08 +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, Daniel Vetter <daniel.vetter@...ll.ch>,
        Peter Rosin <peda@...ntia.se>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 018/639] drm/sti: do not remove the drm_bridge that was never added

From: Peter Rosin <peda@...ntia.se>

[ Upstream commit 66e31a72dc38543b2d9d1ce267dc78ba9beebcfd ]

Removing the drm_bridge_remove call should avoid a NULL dereference
during list processing in drm_bridge_remove if the error path is ever
taken.

The more natural approach would perhaps be to add a drm_bridge_add,
but there are several other bridges that never call drm_bridge_add.
Just removing the drm_bridge_remove is the easier fix.

Fixes: 84601dbdea36 ("drm: sti: rework init sequence")
Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Peter Rosin <peda@...ntia.se>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180806061910.29914-2-peda@axentia.se
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/sti/sti_hda.c  | 1 -
 drivers/gpu/drm/sti/sti_hdmi.c | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_hda.c b/drivers/gpu/drm/sti/sti_hda.c
index 49438337f70dc..19b9b5ed12970 100644
--- a/drivers/gpu/drm/sti/sti_hda.c
+++ b/drivers/gpu/drm/sti/sti_hda.c
@@ -721,7 +721,6 @@ static int sti_hda_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_sysfs:
-	drm_bridge_remove(bridge);
 	return -EINVAL;
 }
 
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index 34cdc46444350..ccf718404a1c2 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1315,7 +1315,6 @@ static int sti_hdmi_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_sysfs:
-	drm_bridge_remove(bridge);
 	hdmi->drm_connector = NULL;
 	return -EINVAL;
 }
-- 
2.20.1