Re: [PATCH] dmaengine: Add a null pointer check to the dma_request_chan

[Vinod Koul]

On 18-01-24, 11:30, Kunwu Chan wrote:
> kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure. Ensure the allocation was successful
> by checking the pointer validity.
> 
> Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
> ---
>  drivers/dma/dmaengine.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
> index 491b22240221..a6f808d13aa4 100644
> --- a/drivers/dma/dmaengine.c
> +++ b/drivers/dma/dmaengine.c
> @@ -856,6 +856,8 @@ struct dma_chan *dma_request_chan(struct device *dev, const char *name)
>  #ifdef CONFIG_DEBUG_FS
>  	chan->dbg_client_name = kasprintf(GFP_KERNEL, "%s:%s", dev_name(dev),
>  					  name);
> +	if (!chan->dbg_client_name)
> +		return chan;

That is wrong, you cant return a half done channel here
Pls see rest of the code for reference

>  #endif
>  
>  	chan->name = kasprintf(GFP_KERNEL, "dma:%s", name);
> -- 
> 2.39.2

-- 
~Vinod