motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 15:53:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

vhost: Distinguish errors in vhost_dev_get_config()

Browse source 
Instead of just returning 0/-1 and letting the caller make up a
meaningless error message, add an Error parameter to allow reporting the
real error and switch to 0/-errno so that different kind of errors can
be distinguished in the caller.

config_len in vhost_user_get_config() is defined by the device, so if
it's larger than VHOST_USER_MAX_CONFIG_SIZE, this is a programming
error. Turn the corresponding check into an assertion.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210609154658.350308-6-kwolf@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2021-06-09 08:46:56 -07:00
parent b8da65689a
commit 50de51387f
10 changed files with 46 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

24
hw/virtio/vhost-user.c
View file

@ -2117,7 +2117,7 @@ static void vhost_user_set_iotlb_callback(struct vhost_dev *dev, int enabled)
}
static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
uint32_t config_len)
uint32_t config_len, Error **errp)
{
VhostUserMsg msg = {
.hdr.request = VHOST_USER_GET_CONFIG,
@ -2127,32 +2127,32 @@ static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
if (!virtio_has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_CONFIG)) {
return -1;
error_setg(errp, "VHOST_USER_PROTOCOL_F_CONFIG not supported");
return -EINVAL;
}
if (config_len > VHOST_USER_MAX_CONFIG_SIZE) {
return -1;
}
assert(config_len <= VHOST_USER_MAX_CONFIG_SIZE);
msg.payload.config.offset = 0;
msg.payload.config.size = config_len;
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
return -EPROTO;
}
if (vhost_user_read(dev, &msg) < 0) {
return -1;
return -EPROTO;
}
if (msg.hdr.request != VHOST_USER_GET_CONFIG) {
error_report("Received unexpected msg type. Expected %d received %d",
VHOST_USER_GET_CONFIG, msg.hdr.request);
return -1;
error_setg(errp,
"Received unexpected msg type. Expected %d received %d",
VHOST_USER_GET_CONFIG, msg.hdr.request);
return -EINVAL;
}
if (msg.hdr.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) {
error_report("Received bad msg size.");
return -1;
error_setg(errp, "Received bad msg size.");
return -EINVAL;
}
memcpy(config, msg.payload.config.region, config_len);