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author | Halil Pasic | 2019-01-21 13:19:43 +0100 |
---|---|---|
committer | Greg Kroah-Hartman | 2019-03-23 20:09:58 +0100 |
commit | 1653307cf0e7e1fd1af51390f8ae650d74d77f58 (patch) | |
tree | a585b695c2f13898eedec5a3c7b918a3d74735f4 | |
parent | s390/setup: fix early warning messages (diff) | |
download | kernel-qcow2-linux-1653307cf0e7e1fd1af51390f8ae650d74d77f58.tar.gz kernel-qcow2-linux-1653307cf0e7e1fd1af51390f8ae650d74d77f58.tar.xz kernel-qcow2-linux-1653307cf0e7e1fd1af51390f8ae650d74d77f58.zip |
s390/virtio: handle find on invalid queue gracefully
commit 3438b2c039b4bf26881786a1f3450f016d66ad11 upstream.
A queue with a capacity of zero is clearly not a valid virtio queue.
Some emulators report zero queue size if queried with an invalid queue
index. Instead of crashing in this case let us just return -ENOENT. To
make that work properly, let us fix the notifier cleanup logic as well.
Cc: stable@vger.kernel.org
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/s390/virtio/virtio_ccw.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c index b67dc4974f23..ec54538f7ae1 100644 --- a/drivers/s390/virtio/virtio_ccw.c +++ b/drivers/s390/virtio/virtio_ccw.c @@ -272,6 +272,8 @@ static void virtio_ccw_drop_indicators(struct virtio_ccw_device *vcdev) { struct virtio_ccw_vq_info *info; + if (!vcdev->airq_info) + return; list_for_each_entry(info, &vcdev->virtqueues, node) drop_airq_indicator(info->vq, vcdev->airq_info); } @@ -413,7 +415,7 @@ static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF); if (ret) return ret; - return vcdev->config_block->num; + return vcdev->config_block->num ?: -ENOENT; } static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw) |