linux-kernel - Re: [PATCH 1/1] staging: ion: Fix error handling in ion_buffer

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Message-ID: <560C260C.3060000@redhat.com>
Date:	Wed, 30 Sep 2015 11:12:28 -0700
From:	Laura Abbott <labbott@...hat.com>
To:	Rohit kumar <rohit.kr@...sung.com>, gregkh@...uxfoundation.org,
	arve@...roid.com, riandrews@...roid.com, dan.carpenter@...cle.com,
	sumit.semwal@...aro.org, mitchelh@...eaurora.org,
	akpm@...ux-foundation.org, linux@...musvillemoes.dk,
	dmitry.kalinkin@...il.com, elfring@...rs.sourceforge.net,
	gioh.kim@....com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Cc:	pintu.k@...sung.com, me.rohit@...e.com, pintu_agarwal@...oo.com,
	c.rajkumar@...sung.com, sreenathd@...sung.com, cpgs@...sung.com,
	vishnu.ps@...sung.com
Subject: Re: [PATCH 1/1] staging: ion: Fix error handling in ion_buffer_create

On 09/29/2015 10:37 PM, Rohit kumar wrote:
> This patch fixes error handling case when buffer->pages allocation
> fails. Also, it removes unreachable code of checking ret variable
> although it is not updated.
>

Reviewed-by: Laura Abbott <labbott@...hat.com>
  
> Signed-off-by: Rohit kumar <rohit.kr@...sung.com>
> ---
>   drivers/staging/android/ion/ion.c |   14 +++++---------
>   1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index 217aa53..af59e4a 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -213,10 +213,10 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
>   			"heap->ops->map_dma should return ERR_PTR on error"))
>   		table = ERR_PTR(-EINVAL);
>   	if (IS_ERR(table)) {
> -		heap->ops->free(buffer);
> -		kfree(buffer);
> -		return ERR_CAST(table);
> +		ret = -EINVAL;
> +		goto err1;
>   	}
> +
>   	buffer->sg_table = table;
>   	if (ion_buffer_fault_user_mappings(buffer)) {
>   		int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
> @@ -226,7 +226,7 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
>   		buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
>   		if (!buffer->pages) {
>   			ret = -ENOMEM;
> -			goto err1;
> +			goto err;
>   		}
>
>   		for_each_sg(table->sgl, sg, table->nents, i) {
> @@ -235,9 +235,6 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
>   			for (j = 0; j < sg->length / PAGE_SIZE; j++)
>   				buffer->pages[k++] = page++;
>   		}
> -
> -		if (ret)
> -			goto err;
>   	}
>
>   	buffer->dev = dev;
> @@ -261,9 +258,8 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
>
>   err:
>   	heap->ops->unmap_dma(heap, buffer);
> -	heap->ops->free(buffer);
>   err1:
> -	vfree(buffer->pages);
> +	heap->ops->free(buffer);
>   err2:
>   	kfree(buffer);
>   	return ERR_PTR(ret);
>

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