ramfb: fix size calculation

size calculation isn't correct with guest-supplied stride, the last
display line isn't accounted for correctly.

For the typical case of stride > linesize (add padding) we error on the
safe side (calculated size is larger than actual size).

With stride < linesize (scanlines overlap) the calculated size is
smaller than the actual size though so our guest memory mapping might
end up being too small.

While being at it also fix ramfb_create_display_surface to use hwaddr
for the parameters.  That way all calculation are done with hwaddr type
and we can't get funny effects from type castings.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Message-id: 20200429115236.28709-7-kraxel@redhat.com

1 files changed, 10 insertions, 9 deletions

diff --git a/hw/display/ramfb.c b/hw/display/ramfb.c
index 52dae78db4..79b9754a58 100644
--- a/hw/display/ramfb.c
+++ b/hw/display/ramfb.c
@@ -44,10 +44,10 @@ static void ramfb_unmap_display_surface(pixman_image_t *image, void *unused)
 
 static DisplaySurface *ramfb_create_display_surface(int width, int height,
                                                     pixman_format_code_t format,
-                                                    int linesize, uint64_t addr)
+                                                    hwaddr stride, hwaddr addr)
 {
     DisplaySurface *surface;
-    hwaddr size;
+    hwaddr size, mapsize, linesize;
     void *data;
 
     if (width < 16 || width > VBE_DISPI_MAX_XRES ||
@@ -55,19 +55,20 @@ static DisplaySurface *ramfb_create_display_surface(int width, int height,
         format == 0 /* unknown format */)
         return NULL;
 
-    if (linesize == 0) {
-        linesize = width * PIXMAN_FORMAT_BPP(format) / 8;
+    linesize = width * PIXMAN_FORMAT_BPP(format) / 8;
+    if (stride == 0) {
+        stride = linesize;
     }
 
-    size = (hwaddr)linesize * height;
-    data = cpu_physical_memory_map(addr, &size, false);
-    if (size != (hwaddr)linesize * height) {
-        cpu_physical_memory_unmap(data, size, 0, 0);
+    mapsize = size = stride * (height - 1) + linesize;
+    data = cpu_physical_memory_map(addr, &mapsize, false);
+    if (size != mapsize) {
+        cpu_physical_memory_unmap(data, mapsize, 0, 0);
         return NULL;
     }
 
     surface = qemu_create_displaysurface_from(width, height,
-                                              format, linesize, data);
+                                              format, stride, data);
     pixman_image_set_destroy_function(surface->image,
                                       ramfb_unmap_display_surface, NULL);