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55 lines
1.7 KiB
55 lines
1.7 KiB
10 months ago
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From 7404a914b0cafe046703c8381903a80d3def8f8b Mon Sep 17 00:00:00 2001
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From: Donald Sharp <sharpd@nvidia.com>
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Date: Fri, 3 Mar 2023 21:58:33 -0500
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Subject: [PATCH] bgpd: Fix use beyond end of stream of labeled unicast parsing
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Fixes a couple crashes associated with attempting to read
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beyond the end of the stream.
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Reported-by: Iggy Frankovic <iggyfran@amazon.com>
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Signed-off-by: Donald Sharp <sharpd@nvidia.com>
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---
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bgpd/bgp_label.c | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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diff --git a/bgpd/bgp_label.c b/bgpd/bgp_label.c
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index 0cad119af101..c4a5277553ba 100644
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--- a/bgpd/bgp_label.c
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+++ b/bgpd/bgp_label.c
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@@ -297,6 +297,9 @@ static int bgp_nlri_get_labels(struct peer *peer, uint8_t *pnt, uint8_t plen,
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uint8_t llen = 0;
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uint8_t label_depth = 0;
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+ if (plen < BGP_LABEL_BYTES)
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+ return 0;
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+
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for (; data < lim; data += BGP_LABEL_BYTES) {
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memcpy(label, data, BGP_LABEL_BYTES);
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llen += BGP_LABEL_BYTES;
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@@ -359,6 +362,9 @@ int bgp_nlri_parse_label(struct peer *peer, struct attr *attr,
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memcpy(&addpath_id, pnt, BGP_ADDPATH_ID_LEN);
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addpath_id = ntohl(addpath_id);
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pnt += BGP_ADDPATH_ID_LEN;
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+
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+ if (pnt >= lim)
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+ return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
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}
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/* Fetch prefix length. */
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@@ -377,6 +383,15 @@ int bgp_nlri_parse_label(struct peer *peer, struct attr *attr,
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/* Fill in the labels */
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llen = bgp_nlri_get_labels(peer, pnt, psize, &label);
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+ if (llen == 0) {
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+ flog_err(
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+ EC_BGP_UPDATE_RCV,
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+ "%s [Error] Update packet error (wrong label length 0)",
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+ peer->host);
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+ bgp_notify_send(peer, BGP_NOTIFY_UPDATE_ERR,
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+ BGP_NOTIFY_UPDATE_INVAL_NETWORK);
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+ return BGP_NLRI_PARSE_ERROR_LABEL_LENGTH;
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+ }
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p.prefixlen = prefixlen - BSIZE(llen);
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/* There needs to be at least one label */
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