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diff --git a/epan/dissectors/packet-bzr.c.old b/epan/dissectors/packet-bzr.c
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index be1becb..94d1c7f 100644
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--- a/epan/dissectors/packet-bzr.c.old
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+++ b/epan/dissectors/packet-bzr.c
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@@ -85,7 +85,7 @@ static guint
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get_bzr_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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int next_offset;
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- gint len = 0;
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+ gint len = 0, current_len;
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gint protocol_version_len;
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guint8 cmd = 0;
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@@ -98,7 +98,10 @@ get_bzr_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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len += protocol_version_len + 1;
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/* Headers */
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+ current_len = len;
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len += get_bzr_prefixed_len(tvb, next_offset);
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+ if (current_len > len) /* Make sure we're not going backwards */
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+ return -1;
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while (tvb_reported_length_remaining(tvb, offset + len) > 0) {
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cmd = tvb_get_guint8(tvb, offset + len);
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@@ -107,7 +110,10 @@ get_bzr_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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switch (cmd) {
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case 's':
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case 'b':
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+ current_len = len;
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len += get_bzr_prefixed_len(tvb, offset + len);
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+ if (current_len > len) /* Make sure we're not going backwards */
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+ return -1;
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break;
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case 'o':
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len += 1;
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@@ -130,8 +130,8 @@ dissect_prefixed_bencode(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
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plen = tvb_get_ntohl(tvb, offset);
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- ti = proto_tree_add_item(tree, hf_bzr_prefixed_bencode, tvb, offset, 4 +
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- plen, ENC_NA);
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+ ti = proto_tree_add_item(tree, hf_bzr_prefixed_bencode, tvb, offset, -1,
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+ ENC_NA);
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prefixed_bencode_tree = proto_item_add_subtree(ti, ett_prefixed_bencode);
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if (prefixed_bencode_tree)
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@@ -143,6 +143,8 @@ dissect_prefixed_bencode(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
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tvb, offset+4, plen, ENC_NA);
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}
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+ proto_item_set_len(ti, 4 + plen);
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+
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return 4 + plen;
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}
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@@ -156,18 +158,16 @@ dissect_prefixed_bytes(tvbuff_t *tvb, gint offset, packet_info *pinfo _U_,
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plen = tvb_get_ntohl(tvb, offset);
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- ti = proto_tree_add_item(tree, hf_bzr_bytes, tvb, offset, 4 +
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- plen, ENC_NA);
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+ ti = proto_tree_add_item(tree, hf_bzr_bytes, tvb, offset, -1, ENC_NA);
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prefixed_bytes_tree = proto_item_add_subtree(ti, ett_prefixed_bytes);
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- if (prefixed_bytes_tree)
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- {
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- proto_tree_add_item(prefixed_bytes_tree, hf_bzr_bytes_length,
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- tvb, offset, 4, ENC_BIG_ENDIAN);
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+ proto_tree_add_item(prefixed_bytes_tree, hf_bzr_bytes_length,
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+ tvb, offset, 4, ENC_BIG_ENDIAN);
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- proto_tree_add_item(prefixed_bytes_tree, hf_bzr_bytes_data,
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- tvb, offset+4, plen, ENC_NA);
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- }
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+ proto_tree_add_item(prefixed_bytes_tree, hf_bzr_bytes_data,
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+ tvb, offset+4, plen, ENC_NA);
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+
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+ proto_item_set_len(ti, 4 + plen);
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return 4 + plen;
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}
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@@ -267,7 +267,7 @@ proto_register_bzr(void)
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NULL, 0x0, NULL, HFILL },
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},
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{ &hf_bzr_prefixed_bencode,
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- { "Bencode packet", "bzr.bencode", FT_BYTES, BASE_NONE, NULL, 0x0,
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+ { "Bencode packet", "bzr.bencode", FT_NONE, BASE_NONE, NULL, 0x0,
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"Serialized structure of integers, dictionaries, strings and "
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"lists.", HFILL },
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},
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@@ -280,7 +280,7 @@ proto_register_bzr(void)
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NULL, 0x0, NULL, HFILL },
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},
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{ &hf_bzr_bytes,
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- { "Prefixed bytes", "bzr.bytes", FT_BYTES, BASE_NONE, NULL, 0x0,
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+ { "Prefixed bytes", "bzr.bytes", FT_NONE, BASE_NONE, NULL, 0x0,
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"Bytes field with prefixed 32-bit length", HFILL },
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},
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{ &hf_bzr_bytes_data,
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