linux-kernel - [PATCH AUTOSEL 4.19 06/21] usb: musb: tusb6010: check return value after calling platform_get

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Message-Id: <20211109222311.1235686-6-sashal@kernel.org>
Date:   Tue,  9 Nov 2021 17:22:55 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yang Yingliang <yangyingliang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, balbi@...com,
        linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 06/21] usb: musb: tusb6010: check return value after calling platform_get_resource()

From: Yang Yingliang <yangyingliang@...wei.com>

[ Upstream commit 14651496a3de6807a17c310f63c894ea0c5d858e ]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Link: https://lore.kernel.org/r/20210915034925.2399823-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/musb/tusb6010.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 4ecfbf6bb1fa8..902507da8aa85 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -1103,6 +1103,11 @@ static int tusb_musb_init(struct musb *musb)
 
 	/* dma address for async dma */
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		pr_debug("no async dma resource?\n");
+		ret = -ENODEV;
+		goto done;
+	}
 	musb->async = mem->start;
 
 	/* dma address for sync dma */
-- 
2.33.0