Packet engine: prevent divide by 0

diff --git a/lib/silccore/silcpacket.c b/lib/silccore/silcpacket.c
index 5ccf822fb16977c29274d82db3679be6883250f8..030291a09e83256bc389e02d32e85c48ed53d70c 100644 (file)
--- a/lib/silccore/silcpacket.c
+++ b/lib/silccore/silcpacket.c
@@ -2231,8 +2231,9 @@ static void silc_packet_read_process(SilcPacketStream stream)
 
     /* Padding sanity checks */
     if (cipher && silc_cipher_get_mode(cipher) != SILC_CIPHER_MODE_CTR &&
-       ((normal && paddedlen % block_len != 0) ||
-        (!normal && silc_packet_special_len(header) % block_len != 0))) {
+       ((normal && block_len && paddedlen % block_len != 0) ||
+        (!normal && block_len &&
+          silc_packet_special_len(header) % block_len != 0))) {
       SILC_LOG_DEBUG(("Packet length %d not multiple by cipher block length",
                      paddedlen));
       silc_mutex_unlock(stream->lock);