[gimp/gimp-2-8] Bug 695418 - Unsharp mask crashes for large radii

[Téo Mazars <teom src gnome org>]

commit 38d8312fdebee98a20b33807b09d8a832a4b97b7
Author: Téo Mazars <teo mazars ensimag fr>
Date:   Sun Apr 7 22:29:56 2013 +0200

    Bug 695418 - Unsharp mask crashes for large radii
    
    Make sure we are working on the image range
    (cherry picked from commit 35cc644765c553b6feb24bd56133b6f9f74ed5e4)

 plug-ins/common/unsharp-mask.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/common/unsharp-mask.c b/plug-ins/common/unsharp-mask.c
index e6e3ad8..998c96e 100644
--- a/plug-ins/common/unsharp-mask.c
+++ b/plug-ins/common/unsharp-mask.c
@@ -369,7 +369,7 @@ box_blur_line (const gint    box_width,   /* Width of the kernel           */
       /* If the leading edge has gone off the image, but the output and
        * trailing edge are on the image. (The big loop exits when the
        * output goes off the image. */
-      else
+      else if (trail >= 0)
         {
           for (i = 0; i < bpp; i++)
             {
@@ -377,6 +377,13 @@ box_blur_line (const gint    box_width,   /* Width of the kernel           */
               dest[bpp * output + i] = (ac[i] + (coverage >> 1)) / coverage;
             }
         }
+      /* Leading has gone off the image and trailing isn't yet in it
+       * (small image) */
+      else if (output >= 0)
+        {
+          for (i = 0; i < bpp; i++)
+            dest[bpp * output + i] = (ac[i] + (coverage >> 1)) / coverage;
+        }
 
       lead++;
       output++;