[dpdk-dev] [PATCH 3/6] eal: Fix memory leaks and needless incrementation of pci uio implementation

[Tetsuya Mukawa]

On 2015/03/20 1:20, Iremonger, Bernard wrote:
>
>> -----Original Message-----
>> From: Tetsuya Mukawa [mailto:mukawa at igel.co.jp]
>> Sent: Tuesday, March 17, 2015 9:31 AM
>> To: dev at dpdk.org
>> Cc: Iremonger, Bernard; Richardson, Bruce; Tetsuya Mukawa
>> Subject: [PATCH 3/6] eal: Fix memory leaks and needless incrementation of pci uio implementation
> Hi Tetsuya,
>
> It would be better to reword "needless incrementation of pci uio implementation" to "needless increment of pci_map_addr" in commit line.
>
>> When pci_map_resource() is failed but path is allocated correctly, path won't be freed. Also, when
>> open() is failed, uio_res won't be freed.
>> This patch fixes these memory leaks.
>> When pci_map_resource() is failed, mapaddr will be MAP_FAILED.
>> In this case, pci_map_addr should not be incremented.
>>
>> Also, the patch fixes belows.
> Typo "belows" should be "below".

Hi Bernard,

I appreciate for your checking. I will fix it.

Regards,
Tetsuya

> Regards,
>
> Bernard.
>
>>  - To shrink code, move close().
>>  - Remove fail variable.
>>
>> Signed-off-by: Tetsuya Mukawa <mukawa at igel.co.jp>
>> ---
>>  lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 28 ++++++++++++++--------------
>>  1 file changed, 14 insertions(+), 14 deletions(-)
>>
>> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
>> index b971ec9..5044884 100644
>> --- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
>> +++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
>> @@ -333,7 +333,6 @@ pci_uio_map_resource(struct rte_pci_device *dev)
>>  	maps = uio_res->maps;
>>  	for (i = 0, map_idx = 0; i != PCI_MAX_RESOURCE; i++) {
>>  		int fd;
>> -		int fail = 0;
>>
>>  		/* skip empty BAR */
>>  		phaddr = dev->mem_resource[i].phys_addr; @@ -347,6 +346,11 @@
>> pci_uio_map_resource(struct rte_pci_device *dev)
>>  				loc->domain, loc->bus, loc->devid, loc->function,
>>  				i);
>>
>> +		/* allocate memory to keep path */
>> +		maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
>> +		if (maps[map_idx].path == NULL)
>> +			goto fail0;
>> +
>>  		/*
>>  		 * open resource file, to mmap it
>>  		 */
>> @@ -354,7 +358,7 @@ pci_uio_map_resource(struct rte_pci_device *dev)
>>  		if (fd < 0) {
>>  			RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
>>  					devname, strerror(errno));
>> -			return -1;
>> +			goto fail1;
>>  		}
>>
>>  		/* try mapping somewhere close to the end of hugepages */ @@ -363,23 +367,13 @@
>> pci_uio_map_resource(struct rte_pci_device *dev)
>>
>>  		mapaddr = pci_map_resource(pci_map_addr, fd, 0,
>>  				(size_t)dev->mem_resource[i].len, 0);
>> +		close(fd);
>>  		if (mapaddr == MAP_FAILED)
>> -			fail = 1;
>> +			goto fail1;
>>
>>  		pci_map_addr = RTE_PTR_ADD(mapaddr,
>>  				(size_t)dev->mem_resource[i].len);
>>
>> -		maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
>> -		if (maps[map_idx].path == NULL)
>> -			fail = 1;
>> -
>> -		if (fail) {
>> -			rte_free(uio_res);
>> -			close(fd);
>> -			return -1;
>> -		}
>> -		close(fd);
>> -
>>  		maps[map_idx].phaddr = dev->mem_resource[i].phys_addr;
>>  		maps[map_idx].size = dev->mem_resource[i].len;
>>  		maps[map_idx].addr = mapaddr;
>> @@ -394,6 +388,12 @@ pci_uio_map_resource(struct rte_pci_device *dev)
>>  	TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
>>
>>  	return 0;
>> +
>> +fail1:
>> +	rte_free(maps[map_idx].path);
>> +fail0:
>> +	rte_free(uio_res);
>> +	return -1;
>>  }
>>
>>  #ifdef RTE_LIBRTE_EAL_HOTPLUG
>> --
>> 1.9.1