Check for negative poll timeout in k5_sendto_kdc

(cherry picked from commit 74bee54227deb64a41c2e79f57dd2a2c5ea010a3)

ticket: 7553
version_fixed: 1.11.1
status: resolved

diff --git a/src/lib/krb5/os/sendto_kdc.c b/src/lib/krb5/os/sendto_kdc.c
index 22cd90812662ada503ce9bd408935610aa1a5d3a..96991de955a56e7bfaabc8d572f6956f6b3722cb 100644 (file)
--- a/src/lib/krb5/os/sendto_kdc.c
+++ b/src/lib/krb5/os/sendto_kdc.c
@@ -523,6 +523,10 @@ cm_select_or_poll(const struct select_state *in, struct select_state *out,
             return e;
         timeout = (in->end_time.tv_sec - now.tv_sec) * 1000 +
             (in->end_time.tv_usec - now.tv_usec) / 1000;
+        if (timeout < 0) {
+            *sret = 0;
+            return 0;
+        }
     }
     /* We don't need a separate copy of the selstate for poll, but use one
      * anyone for consistency with the select wrapper. */