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virtio-scsi: fix use-after-free of VirtIOSCSIReq

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scsi_req_continue can complete the request and cause the VirtIOSCSIReq
to be freed.  Fetch req->sreq just once to avoid the bug.

Reported-by: Richard Jones <rjones@redhat.com>
Tested-by: Richard Jones <rjones@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-10-08 01:19:00 +02:00
parent cdebec5e40
commit 35e4e96c4d
1 changed files with 5 additions and 4 deletions
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9
hw/scsi/virtio-scsi.c
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@ -545,11 +545,12 @@ bool virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)
void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI *s, VirtIOSCSIReq *req)
{
if (scsi_req_enqueue(req->sreq)) {
scsi_req_continue(req->sreq);
SCSIRequest *sreq = req->sreq;
if (scsi_req_enqueue(sreq)) {
scsi_req_continue(sreq);
}
bdrv_io_unplug(req->sreq->dev->conf.bs);
scsi_req_unref(req->sreq);
bdrv_io_unplug(sreq->dev->conf.bs);
scsi_req_unref(sreq);
}
static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)