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Date: Sun, 9 Oct 2022 19:54:05 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Zeng Jingxiang <linuszeng@...cent.com>, Robert Foss <robert.foss@...aro.org>, Sasha Levin <sashal@...nel.org>, andrzej.hajda@...el.com, neil.armstrong@...aro.org, airlied@...il.com, daniel@...ll.ch, dri-devel@...ts.freedesktop.org Subject: [PATCH AUTOSEL 5.15 05/25] gpu: lontium-lt9611: Fix NULL pointer dereference in lt9611_connector_init() From: Zeng Jingxiang <linuszeng@...cent.com> [ Upstream commit ef8886f321c5dab8124b9153d25afa2a71d05323 ] A NULL check for bridge->encoder shows that it may be NULL, but it already been dereferenced on all paths leading to the check. 812 if (!bridge->encoder) { Dereference the pointer bridge->encoder. 810 drm_connector_attach_encoder(<9611->connector, bridge->encoder); Signed-off-by: Zeng Jingxiang <linuszeng@...cent.com> Signed-off-by: Robert Foss <robert.foss@...aro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20220727073119.1578972-1-zengjx95@gmail.com Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/gpu/drm/bridge/lontium-lt9611.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c index 29b1ce2140ab..1dcc28a4d853 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -816,13 +816,14 @@ static int lt9611_connector_init(struct drm_bridge *bridge, struct lt9611 *lt961 drm_connector_helper_add(<9611->connector, <9611_bridge_connector_helper_funcs); - drm_connector_attach_encoder(<9611->connector, bridge->encoder); if (!bridge->encoder) { DRM_ERROR("Parent encoder object not found"); return -ENODEV; } + drm_connector_attach_encoder(<9611->connector, bridge->encoder); + return 0; } -- 2.35.1
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