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Only add in src field if it has a non zero address length

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petermcs
2010-11-17 23:11:32 +00:00
parent f0fc277650
commit b87f53c4b4
1 changed files with 2 additions and 2 deletions
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bacnet-stack/src/npdu.c
+2 -2
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@@ -164,7 +164,7 @@ int npdu_encode_pdu(
/* 1 = SNET, SLEN, and SADR present */ /* 1 = SNET, SLEN, and SADR present */
/* SLEN = 0 Invalid */ /* SLEN = 0 Invalid */
/* SLEN > 0 specifies length of SADR field */ /* SLEN > 0 specifies length of SADR field */
if (src && src->net) if (src && src->net && src->len)
npdu[1] |= BIT3; npdu[1] |= BIT3;
/* Bit 2: The value of this bit corresponds to the */ /* Bit 2: The value of this bit corresponds to the */
/* data_expecting_reply parameter in the N-UNITDATA primitives. */ /* data_expecting_reply parameter in the N-UNITDATA primitives. */
@@ -194,7 +194,7 @@ int npdu_encode_pdu(
} }
} }
} }
if (src && src->net) { if (src && src->net && src->len) { /* Only insert if valid */
len += encode_unsigned16(&npdu[len], src->net); len += encode_unsigned16(&npdu[len], src->net);
npdu[len++] = src->len; npdu[len++] = src->len;
/* SLEN = 0 denotes broadcast MAC SADR and SADR field is absent */ /* SLEN = 0 denotes broadcast MAC SADR and SADR field is absent */