[dpdk-dev] net/virtio: Fix crash in virtio_dev_free_mbufs

  virtio_dev_free_mbufs was recently modified to free the
virtqueues but failed to check whether the array was
allocated.  Added a check to ensure vqs was non-null.

Fixes: bdb32afbb610 ("net/virtio: rationalize queue flushing")
Cc: olivier.matz@6wind.com

Signed-off-by: David C Harton <dharton@cisco.com>
---
 drivers/net/virtio/virtio_ethdev.c | 3 +++
 1 file changed, 3 insertions(+)
  

On Sat, Feb 03, 2018 at 09:55:23AM -0500, David C Harton wrote:
> virtio_dev_free_mbufs was recently modified to free the
> virtqueues but failed to check whether the array was
> allocated.  Added a check to ensure vqs was non-null.
> 
> Fixes: bdb32afbb610 ("net/virtio: rationalize queue flushing")
> Cc: olivier.matz@6wind.com
> 
> Signed-off-by: David C Harton <dharton@cisco.com>
> ---

Reviewed-by: Olivier Matz <olivier.matz@6wind.com>

Thank you for this fix.
Out of curiosity, did you see the problem by code review or is there an
easy way to reproduce the crash?
  

On 02/03/2018 03:55 PM, David C Harton wrote:
> virtio_dev_free_mbufs was recently modified to free the
> virtqueues but failed to check whether the array was
> allocated.  Added a check to ensure vqs was non-null.
> 
> Fixes: bdb32afbb610 ("net/virtio: rationalize queue flushing")
> Cc: olivier.matz@6wind.com
> 
> Signed-off-by: David C Harton <dharton@cisco.com>
> ---
>   drivers/net/virtio/virtio_ethdev.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> index 2082d6a..884f74a 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -1975,6 +1975,9 @@ static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
>   	struct rte_mbuf *buf;
>   	int queue_type;
>   
> +	if (hw->vqs == NULL)
> +		return;
> +
>   	for (i = 0; i < nr_vq; i++) {
>   		vq = hw->vqs[i];
>   		if (!vq)
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
  

On 2/3/2018 2:55 PM, David C Harton wrote:
> virtio_dev_free_mbufs was recently modified to free the
> virtqueues but failed to check whether the array was
> allocated.  Added a check to ensure vqs was non-null.
> 
> Fixes: bdb32afbb610 ("net/virtio: rationalize queue flushing")
> Cc: olivier.matz@6wind.com
> 
> Signed-off-by: David C Harton <dharton@cisco.com>

[1] Signed-off-by: David Harton <dharton@cisco.com>

Reviewed-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Applied to dpdk-next-net/master, thanks.


[1]
Hi David,

Since your previous commits has "David Harton" name, to prevent seen as a new
person, I kept same name, fyi.