linux-kernel - [PATCH 4.19 231/293] usb: musb: musb_dsps: request

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Date:   Mon, 20 Sep 2021 18:43:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nadezda Lutovinova <lutovinova@...ras.ru>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 231/293] usb: musb: musb_dsps: request_irq() after initializing musb

From: Nadezda Lutovinova <lutovinova@...ras.ru>

[ Upstream commit 7c75bde329d7e2a93cf86a5c15c61f96f1446cdc ]

If IRQ occurs between calling  dsps_setup_optional_vbus_irq()
and  dsps_create_musb_pdev(), then null pointer dereference occurs
since glue->musb wasn't initialized yet.

The patch puts initializing of neccesery data before registration
of the interrupt handler.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Nadezda Lutovinova <lutovinova@...ras.ru>
Link: https://lore.kernel.org/r/20210819163323.17714-1-lutovinova@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/musb/musb_dsps.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 403eb97915f8..2f6708b8b5c2 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -892,23 +892,22 @@ static int dsps_probe(struct platform_device *pdev)
 	if (!glue->usbss_base)
 		return -ENXIO;
 
-	if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
-		ret = dsps_setup_optional_vbus_irq(pdev, glue);
-		if (ret)
-			goto err_iounmap;
-	}
-
 	platform_set_drvdata(pdev, glue);
 	pm_runtime_enable(&pdev->dev);
 	ret = dsps_create_musb_pdev(glue, pdev);
 	if (ret)
 		goto err;
 
+	if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL) {
+		ret = dsps_setup_optional_vbus_irq(pdev, glue);
+		if (ret)
+			goto err;
+	}
+
 	return 0;
 
 err:
 	pm_runtime_disable(&pdev->dev);
-err_iounmap:
 	iounmap(glue->usbss_base);
 	return ret;
 }
-- 
2.30.2