linux-kernel - [PATCH] hsi: correctly handle return value of kzalloc

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Message-Id: <1445109907-8176-1-git-send-email-wuninsu@gmail.com>
Date:	Sat, 17 Oct 2015 19:25:07 +0000
From:	Insu Yun <wuninsu@...il.com>
To:	sre@...nel.org, linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	Insu Yun <wuninsu@...il.com>
Subject: [PATCH] hsi: correctly handle return value of kzalloc

Since kzalloc can be failed in memory pressure,
its return value should be checked and handled.

Signed-off-by: Insu Yun <wuninsu@...il.com>
---
 drivers/hsi/hsi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c
index fe93712..bda4c26 100644
--- a/drivers/hsi/hsi.c
+++ b/drivers/hsi/hsi.c
@@ -85,12 +85,14 @@ struct hsi_client *hsi_new_client(struct hsi_port *port,
 
 	cl = kzalloc(sizeof(*cl), GFP_KERNEL);
 	if (!cl)
-		return NULL;
+		goto err;
 
 	cl->tx_cfg = info->tx_cfg;
 	if (cl->tx_cfg.channels) {
 		size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels);
 		cl->tx_cfg.channels = kzalloc(size , GFP_KERNEL);
+		if (!cl->tx_cfg.channels)
+			goto err_tx;
 		memcpy(cl->tx_cfg.channels, info->tx_cfg.channels, size);
 	}
 
@@ -98,6 +100,8 @@ struct hsi_client *hsi_new_client(struct hsi_port *port,
 	if (cl->rx_cfg.channels) {
 		size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels);
 		cl->rx_cfg.channels = kzalloc(size , GFP_KERNEL);
+		if (!cl->rx_cfg.channels)
+			goto err_rx;
 		memcpy(cl->rx_cfg.channels, info->rx_cfg.channels, size);
 	}
 
@@ -114,6 +118,12 @@ struct hsi_client *hsi_new_client(struct hsi_port *port,
 	}
 
 	return cl;
+err_rx:
+	kfree(cl->tx_cfg.channels);
+err_tx:
+	kfree(cl);
+err:
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(hsi_new_client);
 
-- 
1.9.1

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