fix #6195

1 files changed, 2 insertions, 1 deletions

diff --git a/src/lib/exchange_api_refresh_common.c b/src/lib/exchange_api_refresh_common.c
index f26c5bcc4..9e9f6e0c0 100644
--- a/src/lib/exchange_api_refresh_common.c
+++ b/src/lib/exchange_api_refresh_common.c
@@ -266,7 +266,8 @@ deserialize_denomination_key (struct TALER_DenominationPublicKey *dk,
           buf,
           sizeof (uint32_t));
   pbuf_size = ntohl (be);
-  if (size < sizeof (uint32_t) + pbuf_size)
+  if ( (size < sizeof (uint32_t) + pbuf_size) ||
+       (sizeof (uint32_t) + pbuf_size < pbuf_size) )
   {
     GNUNET_break (0);
     *ok = GNUNET_NO;