[gdk-pixbuf] jpeg: Fix some integer overflows

[Matthias Clasen <matthiasc src gnome org>]

commit fde8d1d12a32740770253e97ddc9602654e16865
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Aug 24 15:48:51 2015 -0400

    jpeg: Fix some integer overflows
    
    Similar to the previous commit.

 gdk-pixbuf/io-jpeg.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk-pixbuf/io-jpeg.c b/gdk-pixbuf/io-jpeg.c
index fa6bec1..eb48aed 100644
--- a/gdk-pixbuf/io-jpeg.c
+++ b/gdk-pixbuf/io-jpeg.c
@@ -886,7 +886,7 @@ gdk_pixbuf__jpeg_image_load_lines (JpegProgContext  *context,
                         return FALSE;
                 }
 
-                context->dptr += nlines * context->pixbuf->rowstride;
+                context->dptr += (gsize)nlines * context->pixbuf->rowstride;
 
                 /* send updated signal */
                if (context->updated_func)
@@ -1494,7 +1494,7 @@ real_save_jpeg (GdkPixbuf          *pixbuf,
        while (cinfo.next_scanline < cinfo.image_height) {
                /* convert scanline from ARGB to RGB packed */
                for (j = 0; j < w; j++)
-                       memcpy (&(buf[j*3]), &(ptr[i*rowstride + j*n_channels]), 3);
+                       memcpy (&(buf[j*3]), &(ptr[(gsize)i*rowstride + j*n_channels]), 3);
 
                /* write scanline */
                jbuf = (JSAMPROW *)(&buf);