linux-kernel - [PATCH v5 2/2] staging: vt6655: add handling memory leak on vnt

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Date:   Thu, 05 Apr 2018 16:09:20 +0900
From:   Ji-Hun Kim <ji_hun.kim@...sung.com>
To:     dan.carpenter@...cle.com, gregkh@...uxfoundation.org,
        baijiaju1990@...il.com, forest@...ttletooquiet.net
Cc:     dartnorris@...il.com, santhameena13@...il.com,
        julia.lawall@...6.fr, ji_hun.kim@...sung.com, y.k.oh@...sung.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v5 2/2] staging: vt6655: add handling memory leak on
 vnt_start()

There was no code for handling memory leaks of device_init_rings() and
request_irq(). It needs to free allocated memory in the device_init_rings()
, when request_irq() would be failed. Add freeing sequences of irq and
device init rings.

Signed-off-by: Ji-Hun Kim <ji_hun.kim@...sung.com>
---
It's additional memory leak handling patch from the
[PATCH v5 1/2] staging: vt6655: check for memory allocation failures

Changes v2:
- Change label names following coding-style conventions.
- Remove uneccessary goto, just return error number like original code.

 drivers/staging/vt6655/device_main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c
index 700c03c..1ab0e85 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -1237,13 +1237,13 @@ static int vnt_start(struct ieee80211_hw *hw)
 			  IRQF_SHARED, "vt6655", priv);
 	if (ret) {
 		dev_dbg(&priv->pcid->dev, "failed to start irq\n");
-		return ret;
+		goto err_free_rings;
 	}
 
 	dev_dbg(&priv->pcid->dev, "call device init rd0 ring\n");
 	ret = device_init_rd0_ring(priv);
 	if (ret)
-		return ret;
+		goto err_free_irq;
 	ret = device_init_rd1_ring(priv);
 	if (ret)
 		goto err_free_rd0_ring;
@@ -1269,6 +1269,10 @@ static int vnt_start(struct ieee80211_hw *hw)
 	device_free_rd1_ring(priv);
 err_free_rd0_ring:
 	device_free_rd0_ring(priv);
+err_free_irq:
+	free_irq(priv->pcid->irq, priv);
+err_free_rings:
+	device_free_rings(priv);
 	return ret;
 }
 
-- 
1.9.1