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Message-Id: <20200128135852.721847723@linuxfoundation.org>
Date: Tue, 28 Jan 2020 15:02:33 +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 4.9 004/271] 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 e7c243f708702..08808e3701de9 100644
--- a/drivers/gpu/drm/sti/sti_hda.c
+++ b/drivers/gpu/drm/sti/sti_hda.c
@@ -740,7 +740,6 @@ 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 376b0763c874a..a5412a6fbeca2 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -1352,7 +1352,6 @@ 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
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