Coverity: m_can_receive_skb(): Error handling issues

Coverity: m_can_receive_skb(): Error handling issues

[coverity-bot]

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20210331 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  None
    1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context")

Coverity reported the following:

*** CID 1503583:  Error handling issues  (CHECKED_RETURN)
/drivers/net/can/m_can/m_can.c: 470 in m_can_receive_skb()
464     */
465     static void m_can_receive_skb(struct m_can_classdev *cdev,
466     			      struct sk_buff *skb,
467     			      u32 timestamp)
468     {
469     	if (cdev->is_peripheral)
vvv     CID 1503583:  Error handling issues  (CHECKED_RETURN)
vvv     Calling "can_rx_offload_queue_sorted" without checking return value (as is done elsewhere 7 out of 8 times).
470     		can_rx_offload_queue_sorted(&cdev->offload, skb, timestamp);
471     	else
472     		netif_receive_skb(skb);
473     }
474
475     static void m_can_read_fifo(struct net_device *dev, u32 rxfs)

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1503583 ("Error handling issues")
Fixes: 1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context")

Thanks for your attention!

-- 
Coverity-bot

Re: Coverity: m_can_receive_skb(): Error handling issues

[Marc Kleine-Budde]

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On 31.03.2021 15:00:00, coverity-bot wrote:
> This is an experimental semi-automated report about issues detected by
> Coverity from a scan of next-20210331 as part of the linux-next scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
> 
> You're getting this email because you were associated with the identified
> lines of code (noted below) that were touched by commits:
> 
>   None
>     1be37d3b0414 ("can: m_can: fix periph RX path: use rx-offload to ensure skbs are sent from softirq context")
> 
> Coverity reported the following:
> 
> *** CID 1503583:  Error handling issues  (CHECKED_RETURN)
> /drivers/net/can/m_can/m_can.c: 470 in m_can_receive_skb()
> 464     */
> 465     static void m_can_receive_skb(struct m_can_classdev *cdev,
> 466     			      struct sk_buff *skb,
> 467     			      u32 timestamp)
> 468     {
> 469     	if (cdev->is_peripheral)
> vvv     CID 1503583:  Error handling issues  (CHECKED_RETURN)
> vvv     Calling "can_rx_offload_queue_sorted" without checking return value (as is done elsewhere 7 out of 8 times).
> 470     		can_rx_offload_queue_sorted(&cdev->offload, skb, timestamp);
> 471     	else
> 472     		netif_receive_skb(skb);
> 473     }
> 474
> 475     static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
> 
> If this is a false positive, please let us know so we can mark it as
> such, or teach the Coverity rules to be smarter. If not, please make
> sure fixes get into linux-next. :) For patches fixing this, please
> include these lines (but double-check the "Fixes" first):

Excellent bug report! I've send a patch:

https://lore.kernel.org/linux-can/20210401084515.1455013-1-mkl@pengutronix.de/

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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