diff mbox series

[Stable-8.0.4,52/63] hw/virtio-iommu: Fix potential OOB access in virtio_iommu_handle_command()

Message ID 20230804191647.1875608-21-mjt@tls.msk.ru
State New
Headers show
Series Patch Round-up for stable 8.0.4, freeze on 2023-08-05 | expand

Commit Message

Michael Tokarev Aug. 4, 2023, 7:16 p.m. UTC 
From: Eric Auger <eric.auger@redhat.com>

In the virtio_iommu_handle_command() when a PROBE request is handled,
output_size takes a value greater than the tail size and on a subsequent
iteration we can get a stack out-of-band access. Initialize the
output_size on each iteration.

The issue was found with ASAN. Credits to:
Yiming Tao(Zhejiang University)
Gaoning Pan(Zhejiang University)

Fixes: 1733eebb9e7 ("virtio-iommu: Implement RESV_MEM probe request")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Mauro Matteo Cascella <mcascell@redhat.com>
Cc: qemu-stable@nongnu.org

Message-Id: <20230717162126.11693-1-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit cf2f89edf36a59183166ae8721a8d7ab5cd286bd)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff mbox series

Patch

diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 1cd258135d..e84300d50c 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -727,13 +727,15 @@  static void virtio_iommu_handle_command(VirtIODevice *vdev, VirtQueue *vq)
     VirtIOIOMMU *s = VIRTIO_IOMMU(vdev);
     struct virtio_iommu_req_head head;
     struct virtio_iommu_req_tail tail = {};
-    size_t output_size = sizeof(tail), sz;
     VirtQueueElement *elem;
     unsigned int iov_cnt;
     struct iovec *iov;
     void *buf = NULL;
+    size_t sz;
 
     for (;;) {
+        size_t output_size = sizeof(tail);
+
         elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
         if (!elem) {
             return;