PathExtensions: Fix index out of bounds in TryReplaceSubPath

Fixes #5977

1 files changed, 8 insertions, 2 deletions

diff --git a/Emby.Server.Implementations/Library/PathExtensions.cs b/Emby.Server.Implementations/Library/PathExtensions.cs
index 770cf6bb0..0de4edb7e 100644
--- a/Emby.Server.Implementations/Library/PathExtensions.cs
+++ b/Emby.Server.Implementations/Library/PathExtensions.cs
@@ -96,8 +96,14 @@ namespace Emby.Server.Implementations.Library
             // We have to ensure that the sub path ends with a directory separator otherwise we'll get weird results
             // when the sub path matches a similar but in-complete subpath
             var oldSubPathEndsWithSeparator = subPath[^1] == newDirectorySeparatorChar;
-            if (!path.StartsWith(subPath, StringComparison.OrdinalIgnoreCase)
-                || (!oldSubPathEndsWithSeparator && path[subPath.Length] != newDirectorySeparatorChar))
+            if (!path.StartsWith(subPath, StringComparison.OrdinalIgnoreCase))
+            {
+                return false;
+            }
+
+            if (path.Length > subPath.Length
+                && !oldSubPathEndsWithSeparator
+                && path[subPath.Length] != newDirectorySeparatorChar)
             {
                 return false;
             }