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-rw-r--r--nts_ntp_client.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/nts_ntp_client.c b/nts_ntp_client.c
index 10cf071..2f4b728 100644
--- a/nts_ntp_client.c
+++ b/nts_ntp_client.c
@@ -650,6 +650,7 @@ load_cookies(NNC_Instance inst)
sizeof (inst->context.c2s.key));
if (inst->context.s2c.length != SIV_GetKeyLength(algorithm) ||
+ inst->context.s2c.length <= 0 ||
inst->context.c2s.length != inst->context.s2c.length)
goto error;