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

[Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>]

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@gmail.com>
Reviewed-by: Venkateswararao Jujjuri <jvrao@linux.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);
>   	}