[PATCH] kexec: socket not released when error situation occur.

[Baoquan He]

On 08/25/16 at 11:15am, YoungHyun Yoo wrote:
> Fix resourceleek in ifdown function when error occur.

resource leak?

> 
> Signed-off-by: YoungHyun Yoo <yooyoo.yoo at samsung.com>
> ---
>  kexec/ifdown.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/kexec/ifdown.c b/kexec/ifdown.c
> index 46b7bef..9679ad7 100644
> --- a/kexec/ifdown.c
> +++ b/kexec/ifdown.c
> @@ -1,6 +1,6 @@
>  /*
> - * ifdown.c	Find all network interfaces on the system and
> - *		shut them down.
> + * ifdown.c Find all network interfaces on the system and
> + *      shut them down.
>   *
>   */
>  char *v_ifdown = "@(#)ifdown.c  1.11  02-Jun-1998  miquels at cistron.nl";
> @@ -20,10 +20,10 @@ char *v_ifdown = "@(#)ifdown.c  1.11  02-Jun-1998  miquels at cistron.nl";
>  #include <netinet/in.h>
>  
>  /*
> - *	First, we find all shaper devices and down them. Then we
> - *	down all real interfaces. This is because the comment in the
> - *	shaper driver says "if you down the shaper device before the
> - *	attached inerface your computer will follow".
> + *  First, we find all shaper devices and down them. Then we
> + *  down all real interfaces. This is because the comment in the
> + *  shaper driver says "if you down the shaper device before the
> + *  attached inerface your computer will follow".
>   */
>  int ifdown(void)
>  {
> @@ -34,13 +34,13 @@ int ifdown(void)
>  	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
>  		fprintf(stderr, "ifdown: ");
>  		perror("socket");
> -		return -1;
> +		goto error;
>  	}
>  
>  	if ((ifa = if_nameindex()) == NULL) {
>  		fprintf(stderr, "ifdown: ");
>  		perror("if_nameindex");
> -		return -1;
> +		goto error;
>  	}
>  
>  	for (shaper = 1; shaper >= 0; shaper--) {
> @@ -57,18 +57,22 @@ int ifdown(void)
>  			if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
>  				fprintf(stderr, "ifdown: shutdown ");
>  				perror(ifp->if_name);
> -				return -1;
> +				goto error;
>  			}
>  			ifr.ifr_flags &= ~(IFF_UP);
>  			if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
>  				fprintf(stderr, "ifdown: shutdown ");
>  				perror(ifp->if_name);
> -				return -1;
> +				goto error;
>  			}
>  
>  		}
>  	}
> -	close(fd);
>  
> +	close(fd);
>  	return 0;
> +
> +error:
> +	close(fd);
> +	return -1;
>  }
> -- 
> 2.9.0.GIT
> 
> 
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