48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
From 766eec1b7accffe2c04a5c9ebb14e9f487bb9f78 Mon Sep 17 00:00:00 2001
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From: Donald Sharp <sharpd@nvidia.com>
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Date: Wed, 2 Nov 2022 13:24:48 -0400
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Subject: [PATCH] bgpd: Ensure that bgp open message stream has enough data to
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read
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If a operator receives an invalid packet that is of insufficient size
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then it is possible for BGP to assert during reading of the packet
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instead of gracefully resetting the connection with the peer.
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Signed-off-by: Donald Sharp <sharpd@nvidia.com>
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---
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bgpd/bgp_packet.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
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index 769f9613da8..72d6a923175 100644
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--- a/bgpd/bgp_packet.c
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+++ b/bgpd/bgp_packet.c
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@@ -1386,8 +1386,27 @@ static int bgp_open_receive(struct peer *peer, bgp_size_t size)
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|| CHECK_FLAG(peer->flags, PEER_FLAG_EXTENDED_OPT_PARAMS)) {
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uint8_t opttype;
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+ if (STREAM_READABLE(peer->curr) < 1) {
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+ flog_err(
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+ EC_BGP_PKT_OPEN,
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+ "%s: stream does not have enough bytes for extended optional parameters",
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+ peer->host);
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+ bgp_notify_send(peer, BGP_NOTIFY_OPEN_ERR,
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+ BGP_NOTIFY_OPEN_MALFORMED_ATTR);
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+ return BGP_Stop;
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+ }
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+
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opttype = stream_getc(peer->curr);
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if (opttype == BGP_OPEN_NON_EXT_OPT_TYPE_EXTENDED_LENGTH) {
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+ if (STREAM_READABLE(peer->curr) < 2) {
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+ flog_err(
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+ EC_BGP_PKT_OPEN,
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+ "%s: stream does not have enough bytes to read the extended optional parameters optlen",
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+ peer->host);
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+ bgp_notify_send(peer, BGP_NOTIFY_OPEN_ERR,
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+ BGP_NOTIFY_OPEN_MALFORMED_ATTR);
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+ return BGP_Stop;
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+ }
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optlen = stream_getw(peer->curr);
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SET_FLAG(peer->sflags,
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PEER_STATUS_EXT_OPT_PARAMS_LENGTH);
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