[libcroco] tknzr: support only max long rgb values

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 9ad72875e9f08e4c519ef63d44cdbd94aa9504f7
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date:   Sun Apr 16 13:56:09 2017 +0200

    tknzr: support only max long rgb values
    
    This fixes a possible out of bound when reading rgbs which
    are longer than the support MAXLONG

 src/cr-tknzr.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/src/cr-tknzr.c b/src/cr-tknzr.c
index 1a7cfeb..1548c35 100644
--- a/src/cr-tknzr.c
+++ b/src/cr-tknzr.c
@@ -1279,6 +1279,11 @@ cr_tknzr_parse_rgb (CRTknzr * a_this, CRRgb ** a_rgb)
         status = cr_tknzr_parse_num (a_this, &num);
         ENSURE_PARSING_COND ((status == CR_OK) && (num != NULL));
 
+        if (num->val > G_MAXLONG) {
+                status = CR_PARSING_ERROR;
+                goto error;
+        }
+
         red = num->val;
         cr_num_destroy (num);
         num = NULL;
@@ -1298,6 +1303,11 @@ cr_tknzr_parse_rgb (CRTknzr * a_this, CRRgb ** a_rgb)
                 status = cr_tknzr_parse_num (a_this, &num);
                 ENSURE_PARSING_COND ((status == CR_OK) && (num != NULL));
 
+                if (num->val > G_MAXLONG) {
+                        status = CR_PARSING_ERROR;
+                        goto error;
+                }
+
                 PEEK_BYTE (a_this, 1, &next_bytes[0]);
                 if (next_bytes[0] == '%') {
                         SKIP_CHARS (a_this, 1);