libcroco: CVE-2017-7961

* CVE-2017-7961
The cr_tknzr_parse_rgb function in cr-tknzr.c in libcroco has an
"outside the range of representable values of type long" undefined
behavior issue, which might allow remote attackers to cause a denial
of service (application crash) or possibly have unspecified other
impact via a crafted CSS file.

CVE: CVE-2017-7961
Ref: https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-7961
(From OE-Core rev: 9b321cf141c3fa18d5b85f17ffe1710f4555ca49)

Signed-off-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 48 insertions, 1 deletions

diff --git a/meta/recipes-support/libcroco/libcroco/CVE-2017-7961.patch b/meta/recipes-support/libcroco/libcroco/CVE-2017-7961.patch
new file mode 100644
index 0000000000..8ac11ec498
--- /dev/null
+++ b/meta/recipes-support/libcroco/libcroco/CVE-2017-7961.patch
@@ -0,0 +1,46 @@
+From 5fa3165613b77b516e2b0dc128f73b673bd3ec8b Mon Sep 17 00:00:00 2001
+From: Ignacio Casal Quinteiro <qignacio@amazon.com>
+Date: Sun, 16 Apr 2017 13:56:09 +0200
+Subject: [PATCH] tknzr: support only max long rgb values
+
+This fixes a possible out of bound when reading rgbs which
+are longer than the support MAXLONG
+
+Upstream-Status: Backport [https://git.gnome.org/browse/libcroco/patch/?id=9ad72875e9f08e4c519ef63d44cdbd94aa9504f7]
+CVE: CVE-2017-7961
+Signed-off-by: Sinan Kaya <okaya@kernel.org>
+---
+ src/cr-tknzr.c | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/src/cr-tknzr.c b/src/cr-tknzr.c
+index e3af0ee..76886ec 100644
+--- a/src/cr-tknzr.c
++++ b/src/cr-tknzr.c
+@@ -1280,6 +1280,11 @@ 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;
+@@ -1299,6 +1304,11 @@ 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);
+-- 
+2.19.0
+
diff --git a/meta/recipes-support/libcroco/libcroco_0.6.12.bb b/meta/recipes-support/libcroco/libcroco_0.6.12.bb
index 5b962ee738..c7507e0d51 100644
--- a/meta/recipes-support/libcroco/libcroco_0.6.12.bb
+++ b/meta/recipes-support/libcroco/libcroco_0.6.12.bb
@@ -16,7 +16,8 @@ BINCONFIG = "${bindir}/croco-0.6-config"
 
 inherit gnomebase gtk-doc binconfig-disabled
 
-SRC_URI += "file://CVE-2017-7960.patch"
+SRC_URI += "file://CVE-2017-7960.patch \
+            file://CVE-2017-7961.patch "
 
 SRC_URI[archive.md5sum] = "bc0984fce078ba2ce29f9500c6b9ddce"
 SRC_URI[archive.sha256sum] = "ddc4b5546c9fb4280a5017e2707fbd4839034ed1aba5b7d4372212f34f84f860"