Bug 693658: Improve validation of image parameters

To avoid overflow, check that parameter is withing the given range
before the parameter is converted to int. Stop interpolation of 0-width
or 0-length images because interpolation code divides by 0 in this case.

1 files changed, 4 insertions, 0 deletions

diff --git a/gs/base/gxiscale.c b/gs/base/gxiscale.c
index 9a3f9e219..93fa06bc3 100644
--- a/gs/base/gxiscale.c
+++ b/gs/base/gxiscale.c
@@ -95,6 +95,10 @@ gs_image_class_0_interpolate(gx_image_enum * penum)
         penum->interpolate = false;
         return 0;
     }
+    if (penum->Width == 0 || penum->Height == 0) {
+        penum->interpolate = false; /* No need to interpolate and      */
+        return 0;                  /* causes division by 0 if we try. */
+    }
     if ( pcs->cmm_icc_profile_data != NULL ) {
         use_icc = true;
     }