diff mbox

mmc: dw_mmc: NULL dereference in error message

Message ID 20151022195346.GD24439@mwanda (mailing list archive)
State New, archived
Headers show

Commit Message

Dan Carpenter Oct. 22, 2015, 7:53 p.m. UTC
The "host->dms->ch" pointer is NULL here so we can't use it to print the
error message.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Jaehoon Chung Oct. 23, 2015, 12:58 a.m. UTC | #1
Hi,

Thanks for pointing out.
I will pick this patch at my repository.

Best Regards,
Jaehoon Chung

On 10/23/2015 04:53 AM, Dan Carpenter wrote:
> The "host->dms->ch" pointer is NULL here so we can't use it to print the
> error message.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 6e600e8..f877b2c 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -752,9 +752,7 @@ static int dw_mci_edmac_init(struct dw_mci *host)
>  
>  	host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
>  	if (!host->dms->ch) {
> -		dev_err(host->dev,
> -			"Failed to get external DMA channel %d\n",
> -			host->dms->ch->chan_id);
> +		dev_err(host->dev, "Failed to get external DMA channel.\n");
>  		kfree(host->dms);
>  		host->dms = NULL;
>  		return -ENXIO;
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 6e600e8..f877b2c 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -752,9 +752,7 @@  static int dw_mci_edmac_init(struct dw_mci *host)
 
 	host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
 	if (!host->dms->ch) {
-		dev_err(host->dev,
-			"Failed to get external DMA channel %d\n",
-			host->dms->ch->chan_id);
+		dev_err(host->dev, "Failed to get external DMA channel.\n");
 		kfree(host->dms);
 		host->dms = NULL;
 		return -ENXIO;