![Peter Korsgaard](/assets/img/avatar_default.png)
>From the advisory: http://www.openwall.com/lists/oss-security/2017/10/30/4 It was discovered that the bgpd daemon in the Quagga routing suite does not properly calculate the length of multi-segment AS_PATH UPDATE messages, causing bgpd to drop a session and potentially resulting in loss of network connectivity. Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
From 7a42b78be9a4108d98833069a88e6fddb9285008 Mon Sep 17 00:00:00 2001
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From: Andreas Jaggi <aj@open.ch>
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Date: Mon, 2 Oct 2017 19:38:43 +0530
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Subject: [PATCH] bgpd: Fix AS_PATH size calculation for long paths
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If you have an AS_PATH with more entries than
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what can be written into a single AS_SEGMENT_MAX
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it needs to be broken up. The code that noticed
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that the AS_PATH needs to be broken up was not
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correctly calculating the size of the resulting
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message. This patch addresses this issue.
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Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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---
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bgpd/bgp_aspath.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/bgpd/bgp_aspath.c b/bgpd/bgp_aspath.c
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index b7af5e88..d813bfba 100644
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--- a/bgpd/bgp_aspath.c
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+++ b/bgpd/bgp_aspath.c
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@@ -903,7 +903,7 @@ aspath_put (struct stream *s, struct aspath *as, int use32bit )
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assegment_header_put (s, seg->type, AS_SEGMENT_MAX);
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assegment_data_put (s, seg->as, AS_SEGMENT_MAX, use32bit);
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written += AS_SEGMENT_MAX;
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- bytes += ASSEGMENT_SIZE (written, use32bit);
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+ bytes += ASSEGMENT_SIZE (AS_SEGMENT_MAX, use32bit);
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}
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/* write the final segment, probably is also the first */
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--
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2.11.0
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