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vdpa: Protect vdpa reset with cf_mutex 

Call reset using the wrapper function vdpa_reset() to make sure the
operation is serialized with cf_mutex.

This comes to protect from the following possible scenario:

vhost_vdpa_set_status() could call the reset op. Since the call is not
protected by cf_mutex, a netlink thread calling vdpa_dev_config_fill
could get passed the VIRTIO_CONFIG_S_FEATURES_OK check in
vdpa_dev_config_fill() and end up reporting wrong features.

Fixes: 5f6e85953d8f ("vdpa: Read device configuration only if FEATURES_OK")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220111183400.38418-3-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu<si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eli Cohen 2022-01-11 20:33:58 +02:00 committed by Michael S. Tsirkin
parent f6d955d808
commit 680ab9d69a
1 changed files with 1 additions and 1 deletions
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2
drivers/vhost/vdpa.c
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@ -178,7 +178,7 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
vhost_vdpa_unsetup_vq_irq(v, i); vhost_vdpa_unsetup_vq_irq(v, i);
if (status == 0) { if (status == 0) {
ret = ops->reset(vdpa); ret = vdpa_reset(vdpa);
if (ret) if (ret)
return ret; return ret;
} else } else