From e6c58fdc085f8875361563551699bcf02e3ede8b Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Thu, 15 Sep 2022 14:12:53 -0600
Subject: [PATCH] caddyfile: Prevent infinite nesting on fmt (fix #4175)

---
 caddyconfig/caddyfile/formatter.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/caddyconfig/caddyfile/formatter.go b/caddyconfig/caddyfile/formatter.go
index cb0033f7..3981cd69 100644
--- a/caddyconfig/caddyfile/formatter.go
+++ b/caddyconfig/caddyfile/formatter.go
@@ -153,7 +153,10 @@ func Format(input []byte) []byte {
 			openBraceWritten = true
 			nextLine()
 			newLines = 0
-			nesting++
+			// prevent infinite nesting from ridiculous inputs (issue #4175)
+			if nesting < 10 {
+				nesting++
+			}
 		}
 
 		switch {