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| author | Jacob Keller <jacob.e.keller@intel.com> | 2023-02-27 22:41:27 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-04-21 09:02:29 +0200 |
| commit | e4be66e5f36b8cd2a052ba9e2ba063e6c37f5453 (patch) | |
| tree | 5df0bbda6cdfb1e93268b9f402ba613eede10db5 /drivers/vhost | |
| parent | vdpa/mlx5: Avoid losing link state updates (diff) | |
| download | linux-e4be66e5f36b8cd2a052ba9e2ba063e6c37f5453.tar.xz linux-e4be66e5f36b8cd2a052ba9e2ba063e6c37f5453.zip | |
vhost: use struct_size and size_add to compute flex array sizes
The vhost_get_avail_size and vhost_get_used_size functions compute the size
of structures with flexible array members with an additional 2 bytes if the
VIRTIO_RING_F_EVENT_IDX feature flag is set. Convert these functions to use
struct_size() and size_add() instead of coding the calculation by hand.
This ensures that the calculations will saturate at SIZE_MAX rather than
overflowing.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Cc: kvm@vger.kernel.org
Message-Id: <20230227214127.3678392-1-jacob.e.keller@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index f11bdbe4c2c5..43fa626d4e44 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -436,8 +436,7 @@ static size_t vhost_get_avail_size(struct vhost_virtqueue *vq, size_t event __maybe_unused = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; - return sizeof(*vq->avail) + - sizeof(*vq->avail->ring) * num + event; + return size_add(struct_size(vq->avail, ring, num), event); } static size_t vhost_get_used_size(struct vhost_virtqueue *vq, @@ -446,8 +445,7 @@ static size_t vhost_get_used_size(struct vhost_virtqueue *vq, size_t event __maybe_unused = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0; - return sizeof(*vq->used) + - sizeof(*vq->used->ring) * num + event; + return size_add(struct_size(vq->used, ring, num), event); } static size_t vhost_get_desc_size(struct vhost_virtqueue *vq, |