Re: [PATCH] virtio-vdpa: Fix unchecked call to NULL set_vq_affinity

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On 2023-05-04 a.m.9:50, Dragos Tatulea wrote:
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The referenced patch calls set_vq_affinity without checking if the op is
valid. This patch adds the check.

Fixes: 3dad56823b53 ("virtio-vdpa: Support interrupt affinity spreading mechanism")
Reviewed-by: Gal Pressman <gal@xxxxxxxxxx>
Signed-off-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
---
Reviewed-by: Feng Liu <feliu@xxxxxxxxxx>

  drivers/virtio/virtio_vdpa.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index eb6aee8c06b2..989e2d7184ce 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -385,7 +385,9 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
                         err = PTR_ERR(vqs[i]);
                         goto err_setup_vq;
                 }
-               ops->set_vq_affinity(vdpa, i, &masks[i]);
+
+               if (ops->set_vq_affinity)
+                       ops->set_vq_affinity(vdpa, i, &masks[i]);
         }

         cb.callback = virtio_vdpa_config_cb;
--
2.40.1

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