Actually Fixed: Out of Bounds Potential Read on Pattern Not Found in Vectorised Impl

Author: Sewer56

External/Reloaded.Memory.SigScan.ReloadedII/ModConfig.json

@@ -2,7 +2,7 @@
   "ModId": "Reloaded.Memory.SigScan.ReloadedII",
   "ModName": "Library: Reloaded.Memory.Sigscan for Reloaded II",
   "ModAuthor": "Sewer56",
-  "ModVersion": "1.2.11",
+  "ModVersion": "1.2.13",
   "ModDescription": "Shared implementation of Reloaded.Memory.Sigscan",
   "ModDll": "Reloaded.Memory.SigScan.ReloadedII.dll",
   "ModIcon": "Preview.png",

Reloaded.Memory.Sigscan/Reloaded.Memory.Sigscan.csproj

@@ -21,7 +21,7 @@
 
     <LangVersion>preview</LangVersion>
 	<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <Version>3.1.6</Version>
+    <Version>3.1.8</Version>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' != 'netstandard2.0' And '$(TargetFramework)' != 'netstandard2.1'">

Reloaded.Memory.Sigscan/Scanner_AVX2.cs

@@ -55,7 +55,7 @@ public static PatternScanResult FindPatternAvx2(byte* data, int dataLength, stri
         int matchTableLength = matchTable.Length;
 
         var firstByteVec     = Vector256.Create(patternData.Bytes[patternData.LeadingIgnoreCount]);
-        int searchLength = dataLength - Math.Max(patternData.Bytes.Length >> 5 << 5, AvxRegisterLength); // bitshift rounds down
+        int searchLength = dataLength - (patternData.Bytes.Length +  AvxRegisterLength);
 
         int leadingIgnoreCount = patternData.LeadingIgnoreCount;
         ref var pVec = ref patternVectors[0];
@@ -68,6 +68,11 @@ public static PatternScanResult FindPatternAvx2(byte* data, int dataLength, stri
         var dataMaxPtr = dataPtr + searchLength;
         for (; dataPtr < dataMaxPtr; dataPtr++)
         {
+            if (dataPtr > (void*)0x00000001778b1000)
+            {
+                var a = 5;
+            }
+            
             // Problem: If pattern starts with unknown, will never match.
             var rhs = Avx.LoadVector256(dataPtr);
             var equal = Avx2.CompareEqual(pFirstByteVec, rhs);

Reloaded.Memory.Sigscan/Scanner_SSE2.cs

@@ -54,7 +54,7 @@ public static PatternScanResult FindPatternSse2(byte* data, int dataLength, stri
         int matchTableLength = matchTable.Length;
 
         var firstByteVec  = Vector128.Create(patternData.Bytes[patternData.LeadingIgnoreCount]);
-        int searchLength = dataLength - Math.Max(patternData.Bytes.Length >> 4 << 4, SseRegisterLength); // bitshift rounds down
+        int searchLength = dataLength - (patternData.Bytes.Length +  SseRegisterLength);
 
         int leadingIgnoreCount = patternData.LeadingIgnoreCount;
         ref var pVec = ref patternVectors[0];