linux-kernel - [PATCH 5.4 45/64] drm/msm/dsi: invalid parameter check in msm_dsi_phy

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Message-Id: <20220131105217.201443004@linuxfoundation.org>
Date:   Mon, 31 Jan 2022 11:56:30 +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,
        José Expósito <jose.exposito89@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH 5.4 45/64] drm/msm/dsi: invalid parameter check in msm_dsi_phy_enable

From: José Expósito <jose.exposito89@...il.com>

commit 5e761a2287234bc402ba7ef07129f5103bcd775c upstream.

The function performs a check on the "phy" input parameter, however, it
is used before the check.

Initialize the "dev" variable after the sanity check to avoid a possible
NULL pointer dereference.

Fixes: 5c8290284402b ("drm/msm/dsi: Split PHY drivers to separate files")
Addresses-Coverity-ID: 1493860 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@...il.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Link: https://lore.kernel.org/r/20220116181844.7400-1-jose.exposito89@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -665,12 +665,14 @@ void __exit msm_dsi_phy_driver_unregiste
 int msm_dsi_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
 			struct msm_dsi_phy_clk_request *clk_req)
 {
-	struct device *dev = &phy->pdev->dev;
+	struct device *dev;
 	int ret;
 
 	if (!phy || !phy->cfg->ops.enable)
 		return -EINVAL;
 
+	dev = &phy->pdev->dev;
+
 	ret = dsi_phy_enable_resource(phy);
 	if (ret) {
 		DRM_DEV_ERROR(dev, "%s: resource enable failed, %d\n",