[PATCH] net/tap: fix close for partially configured port

[Bruce Richardson]

On Thu, Mar 26, 2026 at 01:46:11PM +0100, David Marchand wrote:
> In case no rxq has been set up (like when starting testpmd with no mempool
> drivers), a crash happens in tap_dev_close:
> 
> Thread 1 "dpdk-testpmd" received signal SIGSEGV, Segmentation fault.
> 0x00007ffff7fad68b in tap_dev_close (dev=dev at entry=0x4c4a80
> 	<rte_eth_devices at INTERNAL>) at ../drivers/net/tap/rte_eth_tap.c:1111
> 1111			struct rx_queue *rxq = dev->data->rx_queues[i];
> 
> (gdb) p dev->data->rx_queues
> $4 = (void **) 0x0
> 
> Fixes: 23e2387b49a1 ("net/tap: allocate queue structures dynamically")
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---

Looks ok to me.

Acked-by: Bruce Richardson <bruce.richardson at intel.com>

>  drivers/net/tap/rte_eth_tap.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index 64b359914b..6d710131e8 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -1108,17 +1108,22 @@ tap_dev_close(struct rte_eth_dev *dev)
>  #endif
>  
>  	for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) {
> -		struct rx_queue *rxq = dev->data->rx_queues[i];
> +		struct rx_queue *rxq = NULL;
> +		struct rx_queue *txq = NULL;
>  
>  		tap_queue_close(process_private, i);
>  
> +		if (dev->data->rx_queues != NULL)
> +			rxq = dev->data->rx_queues[i];
>  		if (rxq != NULL) {
>  			tap_rxq_pool_free(rxq->pool);
>  			rte_free(rxq);
>  			dev->data->rx_queues[i] = NULL;
>  		}
>  
> -		if (dev->data->tx_queues[i] != NULL) {
> +		if (dev->data->tx_queues != NULL)
> +			txq = dev->data->tx_queues[i];
> +		if (txq != NULL) {
>  			rte_free(dev->data->tx_queues[i]);
>  			dev->data->tx_queues[i] = NULL;
>  		}
> -- 
> 2.53.0
>