From 28e7f6b2ff473c435cae2a4791261aee66413f2d Mon Sep 17 00:00:00 2001
From: polyfloyd <floyd@polyfloyd.net>
Date: Thu, 29 Sep 2022 20:41:20 +0200
Subject: [PATCH] Fix missing bounds check in errorf verb matching (fixes #29)

---
 errorlint/printf.go                        | 3 +++
 errorlint/testdata/src/issues/github-29.go | 8 ++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 errorlint/testdata/src/issues/github-29.go

diff --git a/errorlint/printf.go b/errorlint/printf.go
index f3d81b5..d9a935f 100644
--- a/errorlint/printf.go
+++ b/errorlint/printf.go
@@ -14,6 +14,9 @@ func verbOrder(verbs []verb, numArgs int) [][]verb {
 		if v.index != -1 {
 			i = v.index - 1
 		}
+		if i >= len(orderedVerbs) {
+			continue
+		}
 		orderedVerbs[i] = append(orderedVerbs[i], v)
 		verbs = verbs[1:]
 		i++
diff --git a/errorlint/testdata/src/issues/github-29.go b/errorlint/testdata/src/issues/github-29.go
new file mode 100644
index 0000000..61eeb53
--- /dev/null
+++ b/errorlint/testdata/src/issues/github-29.go
@@ -0,0 +1,8 @@
+package issues
+
+import "fmt"
+
+func Issue29() {
+	err := fmt.Errorf("%v %#[2]v", struct{ string }{})
+	fmt.Println(err)
+}