From: anthony <anthony@git.imagemagick.org>
Date: Fri, 11 May 2012 02:23:39 +0000 (+0000)
Subject: Added sanity checks to EWA resampling
X-Git-Tag: 7.0.1-0~5618
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7d2553e6f4849f937e3b32fcac096a23932a6f64;p=imagemagick

Added sanity checks to EWA resampling
---

diff --git a/MagickCore/resample.c b/MagickCore/resample.c
index 5d7af2f81..f30b4a61c 100644
--- a/MagickCore/resample.c
+++ b/MagickCore/resample.c
@@ -645,8 +645,9 @@ MagickExport MagickBooleanType ResamplePixelColor(
   /*
     Result sanity check -- this should NOT happen
   */
-  if ( hit == 0 ) {
-    /* not enough pixels in resampling, resort to direct interpolation */
+  if ( hit == 0 || divisor_m <= MagickEpsilon || divisor_c <= MagickEpsilon ) {
+    /* not enough pixels, or bad weighting in resampling,
+       resort to direct interpolation */
 #if DEBUG_NO_PIXEL_HIT
     pixel->alpha = pixel->red = pixel->green = pixel->blue = 0;
     pixel->red = QuantumRange; /* show pixels for which EWA fails */