ivshmem-server: use a uint16 for client ID
In practice, the number of VM is limited to MAXUINT16 in ivshmem, so use
the same limit on the server (removes a theorical infinite loop)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
diff --git a/contrib/ivshmem-server/ivshmem-server.c b/contrib/ivshmem-server/ivshmem-server.c
index 56b5df8..53a5173 100644
--- a/contrib/ivshmem-server/ivshmem-server.c
+++ b/contrib/ivshmem-server/ivshmem-server.c
@@ -145,9 +145,18 @@
peer->sock_fd = newfd;
/* get an unused peer id */
- while (ivshmem_server_search_peer(server, server->cur_id) != NULL) {
+ /* XXX: this could use id allocation such as Linux IDA, or simply
+ * a free-list */
+ for (i = 0; i < G_MAXUINT16; i++) {
+ if (ivshmem_server_search_peer(server, server->cur_id) == NULL) {
+ break;
+ }
server->cur_id++;
}
+ if (i == G_MAXUINT16) {
+ IVSHMEM_SERVER_DEBUG(server, "cannot allocate new client id\n");
+ goto fail;
+ }
peer->id = server->cur_id++;
/* create eventfd, one per vector */
diff --git a/contrib/ivshmem-server/ivshmem-server.h b/contrib/ivshmem-server/ivshmem-server.h
index bf7de7a..83c751c 100644
--- a/contrib/ivshmem-server/ivshmem-server.h
+++ b/contrib/ivshmem-server/ivshmem-server.h
@@ -71,7 +71,7 @@
size_t shm_size; /**< size of shm */
int shm_fd; /**< shm file descriptor */
unsigned n_vectors; /**< number of vectors */
- long cur_id; /**< id to be given to next client */
+ uint16_t cur_id; /**< id to be given to next client */
bool verbose; /**< true in verbose mode */
IvshmemServerPeerList peer_list; /**< list of peers */
} IvshmemServer;
