From: Piotr Pawliczek <pawliczek@chromium.org>

Always use tempbuffer instead of the input buffer, even if numpix equals
AdjustedInputWidth, to prevent said input buffer from overflowing because
AdjustedInputWidth >= InputWidth.

Corresponding change in ChromeOS: https://crrev.com/c/3681814

--- a/prnt/hpcups/Halftoner.cpp
+++ b/prnt/hpcups/Halftoner.cpp
@@ -141,22 +141,19 @@ Halftoner::Halftoner
         }
     }
 
-    if (OutputWidth[K] > AdjustedInputWidth)
     // need to expand input data (easier than expanding bit-pixels after) on K row
+    tempBuffer = (BYTE*) new BYTE[(OutputWidth[K])];
+    if (tempBuffer == NULL)
     {
-        tempBuffer = (BYTE*) new BYTE[(OutputWidth[K])];
-        if (tempBuffer == NULL)
+        goto MemoryError;
+    }
+    if (EndPlane > Y)
+    {
+        tempBuffer2 = (BYTE*) new BYTE[(OutputWidth[K])];
+        if (tempBuffer2 == NULL)
         {
             goto MemoryError;
         }
-        if (EndPlane > Y)
-        {
-            tempBuffer2 = (BYTE*) new BYTE[(OutputWidth[K])];
-            if (tempBuffer2 == NULL)
-            {
-                goto MemoryError;
-            }
-        }
     }
 
     Restart();  // this zeroes buffers and sets nextraster counter
@@ -485,21 +482,13 @@ bool Halftoner::Process
 
         for (i=StartPlane; i <= EndPlane; i++)
         {
-            if (OutputWidth[i] > AdjustedInputWidth)
-            {
-                memset(tempBuffer, 0, OutputWidth[i]);  // clear it out because outwidth might be
-                                                        // > factor*inwidth due to roundoff
-                memcpy(tempBuffer,pbyInputKRGBRaster->rasterdata[COLORTYPE_COLOR],InputWidth);
-                int factor = NumRows[i] * ResBoost;
-                PixelMultiply(tempBuffer, InputWidth, factor);
-                input=tempBuffer;
-                numpix = OutputWidth[i];
-            }
-            else
-            {
-                input=pbyInputKRGBRaster->rasterdata[COLORTYPE_COLOR];
-                numpix = AdjustedInputWidth;
-            }
+            memset(tempBuffer, 0, OutputWidth[i]);  // clear it out because outwidth might be
+                                                    // > factor*inwidth due to roundoff
+            memcpy(tempBuffer,pbyInputKRGBRaster->rasterdata[COLORTYPE_COLOR],InputWidth);
+            int factor = NumRows[i] * ResBoost;
+            PixelMultiply(tempBuffer, InputWidth, factor);
+            input=tempBuffer;
+            numpix = OutputWidth[i];
 
             fDitherParms[i].fNumPix = numpix;
             fDitherParms[i].fInput = input;
@@ -560,33 +549,20 @@ bool Halftoner::Process
     if (pbyInputKRGBRaster->rasterdata[COLORTYPE_BLACK])
     {
         int factor = 1;
-        if (OutputWidth[K] > AdjustedInputWidth)
-        {
-            memset(tempBuffer, 0, OutputWidth[K]);
-            memcpy(tempBuffer,pbyInputKRGBRaster->rasterdata[COLORTYPE_BLACK],pbyInputKRGBRaster->rastersize[COLORTYPE_BLACK]);
+        memset(tempBuffer, 0, OutputWidth[K]);
+        memcpy(tempBuffer,pbyInputKRGBRaster->rasterdata[COLORTYPE_BLACK],pbyInputKRGBRaster->rastersize[COLORTYPE_BLACK]);
 
-            factor = NumRows[K] * ResBoost;
-            PixelMultiply(tempBuffer, pbyInputKRGBRaster->rastersize[COLORTYPE_BLACK], factor);
-        }
+        factor = NumRows[K] * ResBoost;
+        PixelMultiply(tempBuffer, pbyInputKRGBRaster->rastersize[COLORTYPE_BLACK], factor);
 
         //  Convert 8bit per pixel data into 1 bit per pixel data
         memset(originalKData, 0, (pbyInputKRGBRaster->rastersize[COLORTYPE_BLACK] * factor +7)/8);
         int curBit = 0x80, curByte = 0;
         for (int i=0; i<pbyInputKRGBRaster->rastersize[COLORTYPE_BLACK] * factor; i++)
         {
-            if (OutputWidth[K] > AdjustedInputWidth)
-            {
-                if (tempBuffer[i])
-                {
-                    originalKData[curByte] |= curBit;
-                }
-            }
-            else
+            if (tempBuffer[i])
             {
-                if (pbyInputKRGBRaster->rasterdata[COLORTYPE_BLACK][i])
-                {
-                    originalKData[curByte] |= curBit;
-                }
+                originalKData[curByte] |= curBit;
             }
             if (curBit == 0x01)
             {