From: Артем Глазычев <glazychev@mts.ru>
Date: Tue, 26 Aug 2025 12:04:58 +0000 (+0300)
Subject: linux-cp: don't drain nl-messages during processing
X-Git-Tag: v26.02-rc0~48
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F39%2F43639%2F2;p=vpp.git

linux-cp: don't drain nl-messages during processing

When we process the incoming netlink message queue and have NEW_LINK for a VLAN interface, we call lcp_itf_pair_add.
Internally, drain is called, which corrupts the original vector (probably due to reallocation)

Type: fix

Change-Id: I0487bfb2939a04d8d3c156725086fedd6e9c72c7
Signed-off-by: Artem Glazychev <glazychev@mts.ru>
---

diff --git a/src/plugins/linux-cp/lcp_nl.c b/src/plugins/linux-cp/lcp_nl.c
index 55d2ea54245..95e1adc351d 100644
--- a/src/plugins/linux-cp/lcp_nl.c
+++ b/src/plugins/linux-cp/lcp_nl.c
@@ -756,7 +756,8 @@ lcp_nl_drain_messages (void)
 void
 lcp_nl_pair_add_cb (lcp_itf_pair_t *pair)
 {
-  lcp_nl_drain_messages ();
+  if (!lcp_get_netlink_processing_active ())
+    lcp_nl_drain_messages ();
 }
 
 static clib_error_t *