From 2a5de4e4476b7297e2f4e37b79ef9141a1829947 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Ho=C5=99e=C5=88ovsk=C3=BD?=
 <martin.horenovsky@gmail.com>
Date: Thu, 8 Feb 2024 22:10:39 +0100
Subject: [PATCH] Fix OOB access when computing -# tag for file without
 extension

It is unlikely that this would ever come in practice, but there
is no reason to fix it.

Related to #2798
---
 src/catch2/catch_test_case_info.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/catch2/catch_test_case_info.cpp b/src/catch2/catch_test_case_info.cpp
index c38ee55a..2a4fbd33 100644
--- a/src/catch2/catch_test_case_info.cpp
+++ b/src/catch2/catch_test_case_info.cpp
@@ -85,8 +85,10 @@ namespace Catch {
             while (lastDot > 0 && filename[lastDot - 1] != '.') {
                 --lastDot;
             }
-            --lastDot;
+            // In theory we could have filename without any extension in it
+            if ( lastDot == 0 ) { return StringRef(); }
 
+            --lastDot;
             size_t nameStart = lastDot;
             while (nameStart > 0 && filename[nameStart - 1] != '/' && filename[nameStart - 1] != '\\') {
                 --nameStart;