linux-kernel - [PATCH] usb: phy: msm: fix a possible NULL dereference

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Message-Id: <1447314323-30959-1-git-send-email-clabbe.montjoie@gmail.com>
Date:	Thu, 12 Nov 2015 08:45:23 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	balbi@...com, gregkh@...uxfoundation.org
Cc:	LABBE Corentin <clabbe.montjoie@...il.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH] usb: phy: msm: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later. Renaming id to of_id (like all others do) in the
process.

Reported-by: coverity (CID 1324133)
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/usb/phy/phy-msm-usb.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 80eb991..c4a66cf 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -1506,20 +1506,23 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 {
 	struct msm_otg_platform_data *pdata;
 	struct extcon_dev *ext_id, *ext_vbus;
-	const struct of_device_id *id;
+	const struct of_device_id *of_id;
 	struct device_node *node = pdev->dev.of_node;
 	struct property *prop;
 	int len, ret, words;
 	u32 val, tmp[3];
 
+	of_id = of_match_device(msm_otg_dt_match, &pdev->dev);
+	if (!of_id)
+		return -ENODEV;
+
 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;
 
 	motg->pdata = pdata;
 
-	id = of_match_device(msm_otg_dt_match, &pdev->dev);
-	pdata->phy_type = (enum msm_usb_phy_type) id->data;
+	pdata->phy_type = (enum msm_usb_phy_type)of_id->data;
 
 	motg->link_rst = devm_reset_control_get(&pdev->dev, "link");
 	if (IS_ERR(motg->link_rst))
-- 
2.4.10

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