shithub: jbig2

Download patch

ref: a43f448139d0a72688c9191adab0718b9ef43ec5
parent: 33e85ea71051ad64ca4bb8b874dcf8bed9b66e62
author: Shailesh Mistry <[email protected]>
date: Wed Feb 8 18:13:13 EST 2012

Bug 690870: This patch prevents the image compositing occurring if the src is outside of the clip region.

--- a/jbig2_image.c
+++ b/jbig2_image.c
@@ -198,7 +198,7 @@
     w = src->width;
     h = src->height;
     ss = src->data;
-    /* FIXME: this isn't sufficient for the < 0 cases */
+
     if (x < 0) { w += x; x = 0; }
     if (y < 0) { h += y; y = 0; }
     w = (x + w < dst->width) ? w : dst->width - x;
@@ -208,6 +208,15 @@
       "compositing %dx%d at (%d, %d) after clipping\n",
         w, h, x, y);
 #endif
+
+    /* check for zero clipping region */
+    if ((w <= 0) || (h <= 0))
+    {
+#ifdef JBIG2_DEBUG
+        jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, -1, "zero clipping region");
+#endif
+        return 0;
+    }
 
 #if 0
     /* special case complete/strip replacement */