linux-kernel - [PATCH] usb: misc: eud: Fix missing IRQ check in eud

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Message-ID: <tencent_C40B301A0F71853A540809BE1BB85AB12D07@qq.com>
Date:   Sat, 26 Aug 2023 18:47:47 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     quic_schowdhu@...cinc.com
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        gregkh@...uxfoundation.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhang Shurong <zhang_shurong@...mail.com>
Subject: [PATCH] usb: misc: eud: Fix missing IRQ check in eud_probe()

This func misses checking for platform_get_irq()'s call and may passes the
negative error codes to request_irq(), which takes unsigned IRQ #,
causing it to fail with -EINVAL, overriding an original error code.

Fix this by stop calling request_irq() with invalid IRQ #s.

Fixes: 9a1bf58ccd44 ("usb: misc: eud: Add driver support for Embedded USB Debugger(EUD)")
Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
---
 drivers/usb/misc/qcom_eud.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/misc/qcom_eud.c b/drivers/usb/misc/qcom_eud.c
index 7f371ea1248c..b33c615a2037 100644
--- a/drivers/usb/misc/qcom_eud.c
+++ b/drivers/usb/misc/qcom_eud.c
@@ -204,7 +204,12 @@ static int eud_probe(struct platform_device *pdev)
 	if (IS_ERR(chip->mode_mgr))
 		return PTR_ERR(chip->mode_mgr);
 
-	chip->irq = platform_get_irq(pdev, 0);
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+
+	chip->irq = ret;
+
 	ret = devm_request_threaded_irq(&pdev->dev, chip->irq, handle_eud_irq,
 			handle_eud_irq_thread, IRQF_ONESHOT, NULL, chip);
 	if (ret)
-- 
2.30.2