[freetype2] div-by-zero e66480b56: * src/base/ftobjs.c (FT_Request_Metrics): Avoid division by zero.

[Werner Lemberg]

branch: div-by-zero
commit e66480b56f9e09ded9a355dc1a9c109d8c6e3571
Author: Alexei Podtelezhnikov <apodtele@gmail.com>
Commit: Alexei Podtelezhnikov <apodtele@gmail.com>

    * src/base/ftobjs.c (FT_Request_Metrics): Avoid division by zero.
    
    The division-by-zero might happen in broken fonts (see #1194).
    Instead of returning a huge number from FT_DivFix until and failing
    to scale later, we now bail immediately.
---
 src/base/ftobjs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/base/ftobjs.c b/src/base/ftobjs.c
index 7f1f063cc..8b99a2088 100644
--- a/src/base/ftobjs.c
+++ b/src/base/ftobjs.c
@@ -3276,6 +3276,14 @@
       if ( h < 0 )
         h = -h;
 
+      if ( ( !w && req->width )                     ||
+           ( !h && ( req->height || !req->width ) ) )
+      {
+        FT_ERROR(( "FT_Request_Metrics: Divide by zero\n" ));
+        error = FT_ERR( Divide_By_Zero );
+        goto Exit;
+      }
+
       scaled_w = FT_REQUEST_WIDTH ( req );
       scaled_h = FT_REQUEST_HEIGHT( req );