From c2ef45226d6801acb15854de55a5f5bc728ed65d Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 22 Jan 2010 14:33:53 +0000
Subject: [PATCH] gstate: Check for an invalid matrix before cairo_transform()

Similar to the other checks that will generate an invalid matrix prior
to performing the operation.
---
 src/cairo-gstate.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cairo-gstate.c b/src/cairo-gstate.c
index 7b3180705..9f0e603d0 100644
--- a/src/cairo-gstate.c
+++ b/src/cairo-gstate.c
@@ -677,6 +677,9 @@ _cairo_gstate_transform (cairo_gstate_t	      *gstate,
     cairo_matrix_t tmp;
     cairo_status_t status;
 
+    if (! _cairo_matrix_is_invertible (matrix))
+	return _cairo_error (CAIRO_STATUS_INVALID_MATRIX);
+
     if (_cairo_matrix_is_identity (matrix))
 	return CAIRO_STATUS_SUCCESS;