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vhost-user: check vhost_user_{read,write}() return value 

The vhost-user code is quite inconsistent with error handling. Instead
of ignoring some return values of read/write and silently going on with
invalid state (invalid read for example), break the code flow when the
error happened.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
master
Marc-André Lureau 2016-07-27 01:15:11 +04:00 committed by Michael S. Tsirkin
parent 6fab2f3f60
commit c4843a45e3
1 changed files with 34 additions and 16 deletions
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50
hw/virtio/vhost-user.c
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@ -214,12 +214,14 @@ static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base,
fds[fd_num++] = log->fd;
}
vhost_user_write(dev, &msg, fds, fd_num);
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
return -1;
}
if (shmfd) {
msg.size = 0;
if (vhost_user_read(dev, &msg) < 0) {
return 0;
return -1;
}
if (msg.request != VHOST_USER_SET_LOG_BASE) {
@ -275,7 +277,9 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev,
msg.size += sizeof(msg.payload.memory.padding);
msg.size += fd_num * sizeof(VhostUserMemoryRegion);
vhost_user_write(dev, &msg, fds, fd_num);
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
return -1;
}
return 0;
}
@ -290,7 +294,9 @@ static int vhost_user_set_vring_addr(struct vhost_dev *dev,
.size = sizeof(msg.payload.addr),
};
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
return 0;
}
@ -313,7 +319,9 @@ static int vhost_set_vring(struct vhost_dev *dev,
.size = sizeof(msg.payload.state),
};
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
return 0;
}
@ -360,10 +368,12 @@ static int vhost_user_get_vring_base(struct vhost_dev *dev,
.size = sizeof(msg.payload.state),
};
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
if (vhost_user_read(dev, &msg) < 0) {
return 0;
return -1;
}
if (msg.request != VHOST_USER_GET_VRING_BASE) {
@ -401,7 +411,9 @@ static int vhost_set_vring_file(struct vhost_dev *dev,
msg.payload.u64 |= VHOST_USER_VRING_NOFD_MASK;
}
vhost_user_write(dev, &msg, fds, fd_num);
if (vhost_user_write(dev, &msg, fds, fd_num) < 0) {
return -1;
}
return 0;
}
@ -427,7 +439,9 @@ static int vhost_user_set_u64(struct vhost_dev *dev, int request, uint64_t u64)
.size = sizeof(msg.payload.u64),
};
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
return 0;
}
@ -455,10 +469,12 @@ static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
return 0;
}
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
if (vhost_user_read(dev, &msg) < 0) {
return 0;
return -1;
}
if (msg.request != request) {
@ -489,7 +505,9 @@ static int vhost_user_set_owner(struct vhost_dev *dev)
.flags = VHOST_USER_VERSION,
};
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
return 0;
}
@ -501,7 +519,9 @@ static int vhost_user_reset_device(struct vhost_dev *dev)
.flags = VHOST_USER_VERSION,
};
vhost_user_write(dev, &msg, NULL, 0);
if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
return -1;
}
return 0;
}
@ -588,7 +608,6 @@ static bool vhost_user_requires_shm_log(struct vhost_dev *dev)
static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr)
{
VhostUserMsg msg = { 0 };
int err;
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
@ -605,8 +624,7 @@ static int vhost_user_migration_done(struct vhost_dev *dev, char* mac_addr)
memcpy((char *)&msg.payload.u64, mac_addr, 6);
msg.size = sizeof(msg.payload.u64);
err = vhost_user_write(dev, &msg, NULL, 0);
return err;
return vhost_user_write(dev, &msg, NULL, 0);
}
return -1;
}