Improve sanity checking of reception claim count. Fixes bug 5521.

svn path=/trunk/; revision=35287

1 files changed, 4 insertions, 4 deletions

diff --git a/epan/dissectors/packet-ltp.c b/epan/dissectors/packet-ltp.c
index 08b192c264..1fd47bb065 100644
--- a/epan/dissectors/packet-ltp.c
+++ b/epan/dissectors/packet-ltp.c
@@ -431,14 +431,14 @@ dissect_report_segment(tvbuff_t *tvb, packet_info *pinfo, proto_tree *ltp_tree,
 	}
 
 	rcpt_clm_cnt = evaluate_sdnv(tvb,frame_offset + segment_offset, &rcpt_clm_cnt_size);
-	if (rcpt_clm_cnt < 0){
-		expert_add_info_format(pinfo, ltp_tree, PI_UNDECODED, PI_ERROR, "Negative reception claim count: %d", rcpt_clm_cnt);
-		return 0;
-	}
 	segment_offset += rcpt_clm_cnt_size;
 	if((unsigned)(frame_offset + segment_offset) > tvb_length(tvb)){
 		return 0;
 	}
+	if ((rcpt_clm_cnt < 0) || (rcpt_clm_cnt > (tvb_reported_length_remaining(tvb, frame_offset + segment_offset) / 2))){
+		expert_add_info_format(pinfo, ltp_tree, PI_UNDECODED, PI_ERROR, "Non-sensical reception claim count: %d", rcpt_clm_cnt);
+		return 0;
+	}
 
 	offset = ep_alloc(sizeof(guint64) * rcpt_clm_cnt);
 	offset_size = ep_alloc(sizeof(int) * rcpt_clm_cnt);