linux-kernel - [PATCH] staging: kpc2000: kpc

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Message-Id: <20200623082959.14951-1-novikov@ispras.ru>
Date:   Tue, 23 Jun 2020 11:29:59 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        Sam Muhammed <jane.pnx9@...il.com>,
        Arnd Bergmann <arnd@...db.de>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] staging: kpc2000: kpc_dma: set error code in probe

If device_create() fails during probing the device, kpc_dma_probe() does
not set the error code and returns 0. This can result in various bad
issues later. The patch sets the error code on the corresponding error
handling path.

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

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
---
 drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c b/drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c
index c3b30551e0ca..624d47bae4d1 100644
--- a/drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c
+++ b/drivers/staging/kpc2000/kpc_dma/kpc_dma_driver.c
@@ -140,6 +140,7 @@ int  kpc_dma_probe(struct platform_device *pldev)
 	dev = MKDEV(assigned_major_num, pldev->id);
 	ldev->kpc_dma_dev = device_create(kpc_dma_class, &pldev->dev, dev, ldev, "kpc_dma%d", pldev->id);
 	if (IS_ERR(ldev->kpc_dma_dev)) {
+		rv = PTR_ERR(ldev->kpc_dma_dev);
 		dev_err(&ldev->pldev->dev, "%s: device_create failed: %d\n", __func__, rv);
 		goto err_kfree;
 	}
-- 
2.16.4