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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Heiko Stuebner <heiko@sntech.de>,
        Sasha Levin <alexander.levin@microsoft.com>,
        dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org
Subject: [PATCH AUTOSEL 4.14 67/95] drm/rockchip: psr: do not dereference encoder before it is null checked.
Date:   Tue,  7 May 2019 01:37:56 -0400
Message-Id: <20190507053826.31622-67-sashal@kernel.org>
In-Reply-To: <20190507053826.31622-1-sashal@kernel.org>
References: <20190507053826.31622-1-sashal@kernel.org>
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From: Enric Balletbo i Serra <enric.balletbo@collabora.com>

[ Upstream commit 4eda776c3cefcb1f01b2d85bd8753f67606282b5 ]

'encoder' is dereferenced before it is null sanity checked, hence we
potentially have a null pointer dereference bug. Instead, initialise
drm_drv from encoder->dev->dev_private after we are sure 'encoder' is
not null.

Fixes: 5182c1a556d7f ("drm/rockchip: add an common abstracted PSR driver")
Cc: stable@vger.kernel.org
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20181013105654.11827-1-enric.balletbo@collabora.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
index a553e182ff53..32e7dba2bf5e 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
@@ -221,13 +221,15 @@ EXPORT_SYMBOL(rockchip_drm_psr_flush_all);
 int rockchip_drm_psr_register(struct drm_encoder *encoder,
 			void (*psr_set)(struct drm_encoder *, bool enable))
 {
-	struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
+	struct rockchip_drm_private *drm_drv;
 	struct psr_drv *psr;
 	unsigned long flags;
 
 	if (!encoder || !psr_set)
 		return -EINVAL;
 
+	drm_drv = encoder->dev->dev_private;
+
 	psr = kzalloc(sizeof(struct psr_drv), GFP_KERNEL);
 	if (!psr)
 		return -ENOMEM;
-- 
2.20.1