linux-kernel - Re: [PATCH] touchscreen: check kzalloc memory for data first

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Message-ID: <BANLkTi=qDL8sQf0OkUZ1zAAUCYrgpmwD9g@mail.gmail.com>
Date:	Wed, 11 May 2011 10:45:46 +0800
From:	Steven Liu <lingjiujianke@...il.com>
To:	jy0922.shim@...sung.com, linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org, dmitry.torokhov@...il.com,
	liuqi@...nderst.com
Subject: Re: [PATCH] touchscreen: check kzalloc memory for data first

fixed the code style


new patch is



if kzalloc memroy for data was faild, it will multi free data
memory space. so check the data memory first, is it kzalloc faild
for data, it should goto end and do nothing.

Signed-off-by: LiuQi <liuqi@...nderst.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c
b/drivers/input/touchscreen/atmel_mxt_ts.c
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1039,8 +1039,14 @@ static int __devinit mxt_probe(struct i2c_client *client,
 		return -EINVAL;

 	data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
+	if (!data) {
+		dev_err(&client->dev, "Failed to allocate memory\n");
+		error = -ENOMEM;
+		goto err_alloc_data_mem_faild;
+	}
+
 	input_dev = input_allocate_device();
-	if (!data || !input_dev) {
+	if (!input_dev) {
 		dev_err(&client->dev, "Failed to allocate memory\n");
 		error = -ENOMEM;
 		goto err_free_mem;
@@ -1107,9 +1113,10 @@ err_free_irq:
 	free_irq(client->irq, data);
 err_free_object:
 	kfree(data->object_table);
-err_free_mem:
 	input_free_device(input_dev);
+err_free_mem:
 	kfree(data);
+err_alloc_data_mem_faild:
 	return error;
 }

--
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