linux-kernel - Re: [PATCH] tools: ffs-aio-example: free memory upon failure

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Date:	Wed, 18 Nov 2015 10:46:01 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	"Wei, Jiangang" <weijg.fnst@...fujitsu.com>,
	"standby24x7@...il.com" <standby24x7@...il.com>
Cc:	"rdunlap@...radead.org" <rdunlap@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbi@...com" <balbi@...com>, "jkosina@...e.cz" <jkosina@...e.cz>
Subject: Re: [PATCH] tools: ffs-aio-example: free memory upon failure

Hi Wei,

On 11/18/2015 07:13 AM, Wei, Jiangang wrote:
> To whom it may concern：
> 
> Sorry to bother again,
> But any comment about this patch？
> 

Reviewed-by: Robert Baldyga <r.baldyga@...sung.com>

It looks good to me. By the way, maybe we should also close file
descriptors in error path?

Thanks,
Robert Baldyga

> On Mon, 2015-11-09 at 14:16 +0800, Wei Jiangang wrote:
>> Free buffer to avoid memory leak upon failure occurs.
>>
>> Signed-off-by: Wei Jiangang <weijg.fnst@...fujitsu.com>
>> ---
>>  tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c | 4 ++++
>>  tools/usb/ffs-aio-example/simple/device_app/aio_simple.c       | 4 ++++
>>  2 files changed, 8 insertions(+)
>>
>> diff --git a/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c b/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c
>> index aaca1f44e788..3eb1a92baacf 100644
>> --- a/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c
>> +++ b/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c
>> @@ -263,20 +263,24 @@ int main(int argc, char *argv[])
>>  	sprintf(ep_path, "%s/ep0", argv[1]);
>>  	ep0 = open(ep_path, O_RDWR);
>>  	if (ep0 < 0) {
>> +		free(ep_path);
>>  		perror("unable to open ep0");
>>  		return 1;
>>  	}
>>  	if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
>> +		free(ep_path);
>>  		perror("unable do write descriptors");
>>  		return 1;
>>  	}
>>  	if (write(ep0, &strings, sizeof(strings)) < 0) {
>> +		free(ep_path);
>>  		perror("unable to write strings");
>>  		return 1;
>>  	}
>>  	sprintf(ep_path, "%s/ep1", argv[1]);
>>  	ep1 = open(ep_path, O_RDWR);
>>  	if (ep1 < 0) {
>> +		free(ep_path);
>>  		perror("unable to open ep1");
>>  		return 1;
>>  	}
>> diff --git a/tools/usb/ffs-aio-example/simple/device_app/aio_simple.c b/tools/usb/ffs-aio-example/simple/device_app/aio_simple.c
>> index 1f44a29818bf..ac96892ca5d2 100644
>> --- a/tools/usb/ffs-aio-example/simple/device_app/aio_simple.c
>> +++ b/tools/usb/ffs-aio-example/simple/device_app/aio_simple.c
>> @@ -234,14 +234,17 @@ int main(int argc, char *argv[])
>>  	sprintf(ep_path, "%s/ep0", argv[1]);
>>  	ep0 = open(ep_path, O_RDWR);
>>  	if (ep0 < 0) {
>> +		free(ep_path);
>>  		perror("unable to open ep0");
>>  		return 1;
>>  	}
>>  	if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
>> +		free(ep_path);
>>  		perror("unable do write descriptors");
>>  		return 1;
>>  	}
>>  	if (write(ep0, &strings, sizeof(strings)) < 0) {
>> +		free(ep_path);
>>  		perror("unable to write strings");
>>  		return 1;
>>  	}
>> @@ -249,6 +252,7 @@ int main(int argc, char *argv[])
>>  		sprintf(ep_path, "%s/ep%d", argv[1], i+1);
>>  		ep[i] = open(ep_path, O_RDWR);
>>  		if (ep[i] < 0) {
>> +			free(ep_path);
>>  			printf("unable to open ep%d: %s\n", i+1,
>>  			       strerror(errno));
>>  			return 1;
> 

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