Re: [Kernel-janitors] Re: 2.6.1: net/ipv4/fib_hash.c: check kme

[Arnaldo Carvalho de Melo <acme@conectiva.com.br>]

Seems ok. But I'm picky... see below

Em Wed, Feb 18, 2004 at 10:48:34PM +0100, Francois Romieu escreveu:
> Randy.Dunlap <rddunlap@osdl.org> :
> [...]
> > So, Arnaldo, does this mean that you like this patch?
> 
> Walter, do you see any logic error in the following version of your patch ?
> 
> 
> kmem_cache_create leak.
> 
> Note: fib_hash_init() can be called many times.
> 
> 
>  net/ipv4/fib_hash.c |   18 +++++++++++++-----
>  1 files changed, 13 insertions(+), 5 deletions(-)
> 
> diff -puN net/ipv4/fib_hash.c~kj-fib_hash_init-bad-cache-free net/ipv4/fib_hash.c
> --- linux-2.6.3-rc1-mm1/net/ipv4/fib_hash.c~kj-fib_hash_init-bad-cache-free	2004-02-18 22:26:40.000000000 +0100
> +++ linux-2.6.3-rc1-mm1-fr/net/ipv4/fib_hash.c	2004-02-18 22:37:10.000000000 +0100
> @@ -871,15 +871,18 @@ struct fib_table * __init fib_hash_init(
>  {
>  	struct fib_table *tb;
>  
> -	if (fn_hash_kmem = NULL)
> +	tb = kmalloc(sizeof(struct fib_table) + sizeof(struct fn_hash), GFP_KERNEL);
> +	if (!tb)
> +		goto err_out;
> +
> +	if (!fn_hash_kmem) {
>  		fn_hash_kmem = kmem_cache_create("ip_fib_hash",
>  						 sizeof(struct fib_node),
>  						 0, SLAB_HWCACHE_ALIGN,
>  						 NULL, NULL);
> -
> -	tb = kmalloc(sizeof(struct fib_table) + sizeof(struct fn_hash), GFP_KERNEL);
> -	if (tb = NULL)
> -		return NULL;
> +		if (!fn_hash_kmem)
> +			goto err_free;
> +	}
>  
>  	tb->tb_id = id;
>  	tb->tb_lookup = fn_hash_lookup;
> @@ -890,6 +893,11 @@ struct fib_table * __init fib_hash_init(
>  	tb->tb_dump = fn_hash_dump;
>  	memset(tb->tb_data, 0, sizeof(struct fn_hash));

Here is the place I'd put err_out

err_out:
>  	return tb;
> +
> +err_free:
> +	kfree(tb);

	tb = NULL;
	goto err_out;

> +err_out:
> +	return NULL;
>  }

But as I said, this would be the way I'd do it, to be consistent with
my style of having as few exit points as possible 8)

- Arnaldo
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