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virtio: check F_CONFIG feature before sending GET/SET_CONFIG

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The device might not have this message implemented.
Sending it could result in a connection being terminated.

Change-Id: I53c08f1108ebc7de630569f3983c317cc6510fa4
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/417636
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
This commit is contained in:
Dariusz Stojaczyk 2018-07-03 09:26:33 +02:00 committed by Jim Harris
parent 62844ae3ca
commit 436c0c189b
1 changed files with 8 additions and 0 deletions
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8
lib/virtio/virtio_user.c
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@ -222,6 +222,10 @@ virtio_user_read_dev_config(struct virtio_dev *vdev, size_t offset,
struct virtio_user_dev *dev = vdev->ctx;
struct vhost_user_config cfg = {0};
if ((dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_CONFIG)) == 0) {
return -ENOTSUP;
}
cfg.offset = 0;
cfg.size = VHOST_USER_MAX_CONFIG_SIZE;
@ -241,6 +245,10 @@ virtio_user_write_dev_config(struct virtio_dev *vdev, size_t offset,
struct virtio_user_dev *dev = vdev->ctx;
struct vhost_user_config cfg = {0};
if ((dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_CONFIG)) == 0) {
return -ENOTSUP;
}
cfg.offset = offset;
cfg.size = length;
memcpy(cfg.region, src, length);