From: Greg Kurz Date: Thu, 29 Jun 2017 13:11:50 +0000 (+0200) Subject: virtio-9p: record element after sanity checks X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3a21fb2af07ca6d22e39a766363befbf833f86bb;p=qemu.git virtio-9p: record element after sanity checks If the guest sends a malformed request, we end up with a dangling pointer in V9fsVirtioState. This doesn't seem to cause any bug, but let's remove this side effect anyway. Signed-off-by: Greg Kurz Reviewed-by: Michael S. Tsirkin --- diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c index 245abd8aae..3380bfc0c5 100644 --- a/hw/9pfs/virtio-9p-device.c +++ b/hw/9pfs/virtio-9p-device.c @@ -61,7 +61,6 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) } QEMU_BUILD_BUG_ON(sizeof(out) != 7); - v->elems[pdu->idx] = elem; len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, sizeof(out)); if (len != sizeof(out)) { @@ -70,6 +69,8 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) goto out_free_req; } + v->elems[pdu->idx] = elem; + pdu_submit(pdu, &out); }