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xen/netfront: fix crash when removing device

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When removing a netfront device directly after a suspend/resume cycle
it might happen that the queues have not been setup again, causing a
crash during the attempt to stop the queues another time.

Fix that by checking the queues are existing before trying to stop
them.

This is XSA-465 / CVE-2024-53240.

Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Fixes: d50b7914fa ("xen-netfront: Fix NULL sring after live migration")
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2024-11-07 16:17:00 +01:00
parent f932fb9b40
commit f9244fb55f
1 changed files with 4 additions and 1 deletions
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5
drivers/net/xen-netfront.c
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@ -867,7 +867,7 @@ static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev
static int xennet_close(struct net_device *dev)
{
struct netfront_info *np = netdev_priv(dev);
unsigned int num_queues = dev->real_num_tx_queues;
unsigned int num_queues = np->queues ? dev->real_num_tx_queues : 0;
unsigned int i;
struct netfront_queue *queue;
netif_tx_stop_all_queues(np->netdev);
@ -882,6 +882,9 @@ static void xennet_destroy_queues(struct netfront_info *info)
{
unsigned int i;
if (!info->queues)
return;
for (i = 0; i < info->netdev->real_num_tx_queues; i++) {
struct netfront_queue *queue = &info->queues[i];