server: listener: Prevent integer underflow

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/libostp/server.c b/lib/libostp/server.c
index 5fa7045..794eda0 100644
--- a/lib/libostp/server.c
+++ b/lib/libostp/server.c
@@ -266,6 +266,10 @@ listener_cleanup(struct ostp_listener *lp)
 void
 listener_close(struct ostp_listener *lp, struct ostp_client *c)
 {
+    if (lp->client_count == 0) {
+        return;
+    }
+
     close(c->sockfd);
     c->sockfd = -1;
     memset(&c->session, 0, sizeof(c->session));