netdev - Re: [patch 1/2] 9p: move dereference after NULL check

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Date:	Wed, 07 Sep 2011 08:31:16 -0700
From:	Venkateswararao Jujjuri <jvrao@...ux.vnet.ibm.com>
To:	Dan Carpenter <error27@...il.com>
CC:	Eric Van Hensbergen <ericvh@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"M. Mohan Kumar" <mohan@...ibm.com>,
	"open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch 1/2] 9p: move dereference after NULL check

On 08/26/2011 09:55 AM, Dan Carpenter wrote:
> We dereferenced "req->tc" and "req->rc" before checking for NULL.
>
> Signed-off-by: Dan Carpenter<error27@...il.com>
Reviewed-by: Venkateswararao Jujjuri <jvrao@...ux.vnet.ibm.com>
>
> diff --git a/net/9p/client.c b/net/9p/client.c
> index 3f8c046..b0bcace 100644
> --- a/net/9p/client.c
> +++ b/net/9p/client.c
> @@ -248,10 +248,8 @@ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag, int max_size)
>   		init_waitqueue_head(req->wq);
>   		req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
>   				  GFP_NOFS);
> -		req->tc->capacity = alloc_msize;
>   		req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
>   				  GFP_NOFS);
> -		req->rc->capacity = alloc_msize;
>   		if ((!req->tc) || (!req->rc)) {
>   			printk(KERN_ERR "Couldn't grow tag array\n");
>   			kfree(req->tc);
> @@ -261,6 +259,8 @@ static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag, int max_size)
>   			req->wq = NULL;
>   			return ERR_PTR(-ENOMEM);
>   		}
> +		req->tc->capacity = alloc_msize;
> +		req->rc->capacity = alloc_msize;
>   		req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
>   		req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
>   	}

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