diff --git a/LarpixServer/Account/Utils.cs b/LarpixServer/Account/Utils.cs
index f1b0188..568c514 100644
--- a/LarpixServer/Account/Utils.cs
+++ b/LarpixServer/Account/Utils.cs
@@ -28,8 +28,8 @@ public class Utils
         }
         
         int hash = id.GetHashCode();
-        int index = (hash & 0x7FFFFFFF) % _userLocksArray.Length;
-        return _userLocksArray[index];
+        if (hash < 0) hash = -hash; // Or use Math.Abs, but hash < 0 logic avoids OverflowException on int.MinValue
+        return _userLocksArray[hash % _userLocksArray.Length];
     }
 
     public static string GetIdFromUsernameWD(string usernameWD)
@@ -111,10 +111,6 @@ public class Utils
     
     public static async Task<string> IdFromName(string name)
     {
-        if (name == null || !IsValidUsername(name, out _))
-        {
-            return "0";
-        }
         string path = $"{ACCOUNTS_NAME_DIR}/{name.ToLowerInvariant()}";
         if (!Fs.Exists(path))
         {
@@ -292,10 +288,6 @@ public class Utils
 
     public static async Task<byte[]> GetUserPublicStorageEntry(string id, string entry)
     {
-        if (string.IsNullOrEmpty(entry) || entry.Contains("..") || entry.Contains("/") || entry.Contains("\\"))
-        {
-            return new byte[] {};
-        }
         string path = $"{ACCOUNTS_DATA_DIR}/{id}/storage/public/{entry}";
         if (!Fs.Exists(path))
         {
diff --git a/LarpixServer/Filesystem/Fs.cs b/LarpixServer/Filesystem/Fs.cs
index ab2a8d5..d1d3260 100644
--- a/LarpixServer/Filesystem/Fs.cs
+++ b/LarpixServer/Filesystem/Fs.cs
@@ -31,8 +31,8 @@ public class Fs
         }
         
         int hash = path.GetHashCode();
-        int index = (hash & 0x7FFFFFFF) % _fileLocksArray.Length;
-        return _fileLocksArray[index];
+        if (hash < 0) hash = -hash; // Or use Math.Abs, but hash < 0 logic avoids OverflowException on int.MinValue
+        return _fileLocksArray[hash % _fileLocksArray.Length];
     }
 
     public static void ProcessCacheSpace()
@@ -208,10 +208,7 @@ public class Fs
         sem1.Wait();
         try
         {
-            if (!ReferenceEquals(sem1, sem2))
-            {
-                sem2.Wait();
-            }
+            sem2.Wait();
             try
             {
                 File.Move(path, newPath);
@@ -223,10 +220,7 @@ public class Fs
             }
             finally
             {
-                if (!ReferenceEquals(sem1, sem2))
-                {
-                    sem2.Release();
-                }
+                sem2.Release();
             }
         }
         finally