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GTPv2: fix display of spare bits in Monitoring Event Information IE 

Bug: 16596
Change-Id: I82a8b5cdb341138d3a4928d2fe3a9df2f885ce51
Reviewed-on: https://code.wireshark.org/review/37347
Reviewed-by: Pascal Quantin <pascal@wireshark.org>
This commit is contained in:
Pascal Quantin 2020-05-31 16:41:03 +02:00
parent 5e0ebc9fc0
commit 9888a4c742
1 changed files with 4 additions and 2 deletions
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6
epan/dissectors/packet-gtpv2.c
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@ -8437,13 +8437,15 @@ dissect_gtpv2_ie_common(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree,
proto_tree_add_item(ie_tree, hf_gtpv2_ie_len, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* CR Spare Instance Octet 4*/
proto_tree_add_item(ie_tree, hf_gtpv2_cr, tvb, offset, 1, ENC_BIG_ENDIAN);
/* ch8.120 breaks the format described in ch8.2.1 */
if (type == GTPV2_IE_MON_EVENT_INF) {
proto_tree_add_bits_item(ie_tree, hf_gtpv2_spare_bits, tvb, offset << 3, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(ie_tree, hf_gtpv2_mon_event_inf_nsui, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(ie_tree, hf_gtpv2_mon_event_inf_nsur, tvb, offset, 1, ENC_BIG_ENDIAN);
} else {
/* CR Spare Instance Octet 4*/
proto_tree_add_item(ie_tree, hf_gtpv2_cr, tvb, offset, 1, ENC_BIG_ENDIAN);
}
instance = tvb_get_guint8(tvb, offset) & 0x0f;