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Fix use after free in get_capset_info callback.

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If a response to virtio_gpu_cmd_get_capset_info takes longer than
five seconds to return, the callback will access freed kernel memory
in vg->capsets.

Signed-off-by: Doug Horn <doughorn@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200902210847.2689-2-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Doug Horn 2020-09-02 14:08:25 -07:00 committed by Gerd Hoffmann
parent 707d561f77
commit e219688fc5
2 changed files with 9 additions and 3 deletions
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2
drivers/gpu/drm/virtio/virtgpu_kms.c
View File

@ -80,8 +80,10 @@ static void virtio_gpu_get_capsets(struct virtio_gpu_device *vgdev,
vgdev->capsets[i].id > 0, 5 * HZ); vgdev->capsets[i].id > 0, 5 * HZ);
if (ret == 0) { if (ret == 0) {
DRM_ERROR("timed out waiting for cap set %d\n", i); DRM_ERROR("timed out waiting for cap set %d\n", i);
spin_lock(&vgdev->display_info_lock);
kfree(vgdev->capsets); kfree(vgdev->capsets);
vgdev->capsets = NULL; vgdev->capsets = NULL;
spin_unlock(&vgdev->display_info_lock);
return; return;
} }
DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n", DRM_INFO("cap set %d: id %d, max-version %d, max-size %d\n",

10
drivers/gpu/drm/virtio/virtgpu_vq.c
View File

@ -684,9 +684,13 @@ static void virtio_gpu_cmd_get_capset_info_cb(struct virtio_gpu_device *vgdev,
int i = le32_to_cpu(cmd->capset_index); int i = le32_to_cpu(cmd->capset_index);
spin_lock(&vgdev->display_info_lock); spin_lock(&vgdev->display_info_lock);
vgdev->capsets[i].id = le32_to_cpu(resp->capset_id); if (vgdev->capsets) {
vgdev->capsets[i].max_version = le32_to_cpu(resp->capset_max_version); vgdev->capsets[i].id = le32_to_cpu(resp->capset_id);
vgdev->capsets[i].max_size = le32_to_cpu(resp->capset_max_size); vgdev->capsets[i].max_version = le32_to_cpu(resp->capset_max_version);
vgdev->capsets[i].max_size = le32_to_cpu(resp->capset_max_size);
} else {
DRM_ERROR("invalid capset memory.");
}
spin_unlock(&vgdev->display_info_lock); spin_unlock(&vgdev->display_info_lock);
wake_up(&vgdev->resp_wq); wake_up(&vgdev->resp_wq);
} }