linux-kernel - [PATCH AUTOSEL 5.2 006/171] staging: kpc2000: added missing clean-up to probe_core

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Message-Id: <20190719035643.14300-6-sashal@kernel.org>
Date:   Thu, 18 Jul 2019 23:53:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeremy Sowden <jeremy@...zel.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, devel@...verdev.osuosl.org
Subject: [PATCH AUTOSEL 5.2 006/171] staging: kpc2000: added missing clean-up to probe_core_uio.

From: Jeremy Sowden <jeremy@...zel.net>

[ Upstream commit abb611d2c21c0a4fa8eab35dc936c80d9a07acd8 ]

On error, probe_core_uio just returned an error without freeing
resources which had previously been allocated.  Added the missing
clean-up code.

Updated TODO.

Signed-off-by: Jeremy Sowden <jeremy@...zel.net>
Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/kpc2000/TODO                 | 1 -
 drivers/staging/kpc2000/kpc2000/cell_probe.c | 3 +++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/kpc2000/TODO b/drivers/staging/kpc2000/TODO
index 8c7af29fefae..ed951acc829a 100644
--- a/drivers/staging/kpc2000/TODO
+++ b/drivers/staging/kpc2000/TODO
@@ -1,7 +1,6 @@
 - the kpc_spi driver doesn't seem to let multiple transactions (to different instances of the core) happen in parallel...
 - The kpc_i2c driver is a hot mess, it should probably be cleaned up a ton.  It functions against current hardware though.
 - pcard->card_num in kp2000_pcie_probe() is a global variable and needs atomic / locking / something better.
-- probe_core_uio() probably needs error handling
 - the loop in kp2000_probe_cores() that uses probe_core_uio() also probably needs error handling
 - would be nice if the AIO fileops in kpc_dma could be made to work
     - probably want to add a CONFIG_ option to control compilation of the AIO functions
diff --git a/drivers/staging/kpc2000/kpc2000/cell_probe.c b/drivers/staging/kpc2000/kpc2000/cell_probe.c
index e0dba91e7fa8..d6b57f550876 100644
--- a/drivers/staging/kpc2000/kpc2000/cell_probe.c
+++ b/drivers/staging/kpc2000/kpc2000/cell_probe.c
@@ -295,6 +295,7 @@ int  probe_core_uio(unsigned int core_num, struct kp2000_device *pcard, char *na
     kudev->dev = device_create(kpc_uio_class, &pcard->pdev->dev, MKDEV(0,0), kudev, "%s.%d.%d.%d", kudev->uioinfo.name, pcard->card_num, cte.type, kudev->core_num);
     if (IS_ERR(kudev->dev)) {
         dev_err(&pcard->pdev->dev, "probe_core_uio device_create failed!\n");
+        kfree(kudev);
         return -ENODEV;
     }
     dev_set_drvdata(kudev->dev, kudev);
@@ -302,6 +303,8 @@ int  probe_core_uio(unsigned int core_num, struct kp2000_device *pcard, char *na
     rv = uio_register_device(kudev->dev, &kudev->uioinfo);
     if (rv){
         dev_err(&pcard->pdev->dev, "probe_core_uio failed uio_register_device: %d\n", rv);
+        put_device(kudev->dev);
+        kfree(kudev);
         return rv;
     }
     
-- 
2.20.1