libcroco: patch for CVE-2017-7960

(From OE-Core rev: 2539d7334cbe9693ebe68d33c7a97872a1645510)

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/libcroco/libcroco/CVE-2017-7960.patch

@@ -0,0 +1,56 @@
+input: check end of input before reading a byte
+
+When reading bytes we weren't check that the index wasn't
+out of bound and this could produce an invalid read which
+could deal to a security bug.
+
+Upstream-Status: Backport[https://gitlab.gnome.org/GNOME/libcroco/
+                 commit/898e3a8c8c0314d2e6b106809a8e3e93cf9d4394]
+
+CVE: CVE-2017-7960 
+
+Signed-off-by: Changqing Li <changqing.li@windriver.com>
+
+diff --git a/src/cr-input.c b/src/cr-input.c
+index 49000b1f5f07fe057135f1b8fc69bdcf9613e300..3b63a88ee3b1c56778e58172d147d958951bf099 100644
+--- a/src/cr-input.c
++++ b/src/cr-input.c
+@@ -256,7 +256,7 @@ cr_input_new_from_uri (const gchar * a_file_uri, enum CREncoding a_enc)
+                  *we should  free buf here because it's own by CRInput.
+                  *(see the last parameter of cr_input_new_from_buf().
+                  */
+-                buf = NULL ;
++                buf = NULL;
+         }
+ 
+  cleanup:
+@@ -404,6 +404,8 @@ cr_input_get_nb_bytes_left (CRInput const * a_this)
+ enum CRStatus
+ cr_input_read_byte (CRInput * a_this, guchar * a_byte)
+ {
++        gulong nb_bytes_left = 0;
++
+         g_return_val_if_fail (a_this && PRIVATE (a_this)
+                               && a_byte, CR_BAD_PARAM_ERROR);
+ 
+@@ -413,6 +415,12 @@ cr_input_read_byte (CRInput * a_this, guchar * a_byte)
+         if (PRIVATE (a_this)->end_of_input == TRUE)
+                 return CR_END_OF_INPUT_ERROR;
+ 
++        nb_bytes_left = cr_input_get_nb_bytes_left (a_this);
++
++        if (nb_bytes_left < 1) {
++                return CR_END_OF_INPUT_ERROR;
++        }
++
+         *a_byte = PRIVATE (a_this)->in_buf[PRIVATE (a_this)->next_byte_index];
+ 
+         if (PRIVATE (a_this)->nb_bytes -
+@@ -477,7 +485,6 @@ cr_input_read_char (CRInput * a_this, guint32 * a_char)
+                 if (*a_char == '\n') {
+                         PRIVATE (a_this)->end_of_line = TRUE;
+                 }
+-
+         }
+ 
+         return status;

meta/recipes-support/libcroco/libcroco_0.6.12.bb

@@ -16,5 +16,7 @@ BINCONFIG = "${bindir}/croco-0.6-config"
 
 inherit gnomebase gtk-doc binconfig-disabled
 
+SRC_URI += "file://CVE-2017-7960.patch"
+
 SRC_URI[archive.md5sum] = "bc0984fce078ba2ce29f9500c6b9ddce"
 SRC_URI[archive.sha256sum] = "ddc4b5546c9fb4280a5017e2707fbd4839034ed1aba5b7d4372212f34f84f860"