From b197b713be93fe4b3d2a973612d143dd34f207e5 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 10 Jul 2023 15:23:19 +0930
Subject: [PATCH] bcli: don't feed CLN massive feerates.

Stay classy, signet!

Reported-by: Anthony Towns
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 plugins/bcli.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/plugins/bcli.c b/plugins/bcli.c
index f48169761..bc681697c 100644
--- a/plugins/bcli.c
+++ b/plugins/bcli.c
@@ -683,6 +683,14 @@ static void json_add_feerate(struct json_stream *result, const char *fieldname,
 			     const struct estimatefees_stash *stash,
 			     uint64_t value)
 {
+	/* Anthony Towns reported signet had a 900kbtc fee block, and then
+	 * CLN got upset scanning feerate.  It expects a u32. */
+	if (value > 0xFFFFFFFF) {
+		plugin_log(cmd->plugin, LOG_UNUSUAL,
+			   "Feerate %"PRIu64" is ridiculous: trimming to 32 bites",
+			   value);
+		value = 0xFFFFFFFF;
+	}
 	/* 0 is special, it means "unknown" */
 	if (value && value < stash->perkb_floor) {
 		plugin_log(cmd->plugin, LOG_DBG,