Re: [PATCH] net/sunrpc/svcauth_unix.c: unix_domain_find: return NULL if kmalloc fails

["J. Bruce Fields" <bfields@fieldses.org>]

On Mon, Apr 26, 2004 at 07:17:19PM +0300, Petri T. Koistinen wrote:
> Is this correct fix? What happens when unix_domain_find return NULL?

I just noticed that the other day, and have been testing with the
identical fix; seems to work fine.  All the callers check for NULL
returns and appear to do the right thing.  --Bruce Fields

> --- linux-2.5/net/sunrpc/svcauth_unix.c.orig	2004-04-26 18:58:04.000000000 +0300
> +++ linux-2.5/net/sunrpc/svcauth_unix.c	2004-04-26 18:58:58.000000000 +0300
> @@ -36,36 +36,38 @@ struct unix_domain {
>  struct auth_domain *unix_domain_find(char *name)
>  {
>  	struct auth_domain *rv, ud;
>  	struct unix_domain *new;
> 
>  	ud.name = name;
> 
>  	rv = auth_domain_lookup(&ud, 0);
> 
>   foundit:
>  	if (rv && rv->flavour != RPC_AUTH_UNIX) {
>  		auth_domain_put(rv);
>  		return NULL;
>  	}
>  	if (rv)
>  		return rv;
> 
>  	new = kmalloc(sizeof(*new), GFP_KERNEL);
> +	if (new == NULL)
> +		return NULL;
>  	cache_init(&new->h.h);
>  	atomic_inc(&new->h.h.refcnt);
>  	new->h.name = strdup(name);
>  	new->h.flavour = RPC_AUTH_UNIX;
>  	new->addr_changes = 0;
>  	new->h.h.expiry_time = NEVER;
>  	new->h.h.flags = 0;
> 
>  	rv = auth_domain_lookup(&new->h, 2);
>  	if (rv == &new->h) {
>  		if (atomic_dec_and_test(&new->h.h.refcnt)) BUG();
>  	} else {
>  		auth_domain_put(&new->h);
>  		goto foundit;
>  	}
> 
>  	return rv;
>  }
> -
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