Re: [PATCH v2 03/15] eal: Fix memory leak of pci_uio_map_resource()

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

> -----Original Message-----
> From: Tetsuya Mukawa [mailto:mukawa-AlSX/UN32fvPDbFq/vQRIQ@public.gmane.org]
> Sent: Thursday, March 12, 2015 10:18 AM
> To: dev-VfR2kkLFssw@public.gmane.org
> Cc: Iremonger, Bernard; Richardson, Bruce; Tetsuya Mukawa
> Subject: [PATCH v2 03/15] eal: Fix memory leak of pci_uio_map_resource()
> 
> 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.
> 
> Signed-off-by: Tetsuya Mukawa <mukawa-AlSX/UN32fvPDbFq/vQRIQ@public.gmane.org>
> ---
>  lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 20 +++++++++++++-------
>  1 file changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> index 77bb5ed..901f277 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> @@ -350,6 +350,11 @@ 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
>  		 */
> @@ -357,7 +362,7 @@ 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 fail0;
>  		}
> 
>  		/* try mapping somewhere close to the end of hugepages */ @@ -372,14 +377,9 @@
> pci_uio_map_resource(struct rte_pci_device *dev)
>  		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;
> -
Hi Tetsuya,

Could close(fd) be called before if(fail) and the following two close(fd) calls removed ?

Regards,

Bernard.

>  		if (fail) {
> -			rte_free(uio_res);
>  			close(fd);
> -			return -1;
> +			goto fail1;
>  		}
>  		close(fd);
> 
> @@ -397,6 +397,12 @@ 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