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

["Iremonger, Bernard" <bernard.iremonger-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

> -----Original Message-----
> From: Tetsuya Mukawa [mailto:mukawa-AlSX/UN32fvPDbFq/vQRIQ@public.gmane.org]
> Sent: Tuesday, March 17, 2015 9:31 AM
> To: dev-VfR2kkLFssw@public.gmane.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".

Regards,

Bernard.

>  - To shrink code, move close().
>  - Remove fail variable.
> 
> Signed-off-by: Tetsuya Mukawa <mukawa-AlSX/UN32fvPDbFq/vQRIQ@public.gmane.org>
> ---
>  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