gnu: virglrenderer: Fix CVE-2017-6386.

* gnu/packages/patches/virglrenderer-CVE-2017-6386.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/spice.scm (virglrenderer)[source]: Use it.

gnu/local.mk

@@ -965,6 +965,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/upower-builddir.patch			\
   %D%/packages/patches/valgrind-enable-arm.patch		\
   %D%/packages/patches/vim-CVE-2017-5953.patch			\
+  %D%/packages/patches/virglrenderer-CVE-2017-6386.patch 	\
   %D%/packages/patches/vorbis-tools-CVE-2014-9638+CVE-2014-9639.patch		\
   %D%/packages/patches/vorbis-tools-CVE-2014-9640.patch		\
   %D%/packages/patches/vorbis-tools-CVE-2015-6749.patch		\

gnu/packages/patches/virglrenderer-CVE-2017-6386.patch

@@ -0,0 +1,54 @@
+Fix CVE-2017-6386 (memory leak introduced by fix for CVE-2017-5994).
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5994
+
+Patch copied from upstream source repository:
+
+https://cgit.freedesktop.org/virglrenderer/commit/?id=737c3350850ca4dbc5633b3bdb4118176ce59920
+
+From 737c3350850ca4dbc5633b3bdb4118176ce59920 Mon Sep 17 00:00:00 2001
+From: Dave Airlie <airlied@redhat.com>
+Date: Tue, 28 Feb 2017 14:52:09 +1000
+Subject: renderer: fix memory leak in vertex elements state create
+
+Reported-by: Li Qiang
+Free the vertex array in error path.
+This was introduced by this commit:
+renderer: fix heap overflow in vertex elements state create.
+
+I rewrote the code to not require the allocation in the first
+place if we have an error, seems nicer.
+
+Signed-off-by: Dave Airlie <airlied@redhat.com>
+
+diff --git a/src/vrend_renderer.c b/src/vrend_renderer.c
+index 1bca7ad..e5d9f5c 100644
+--- a/src/vrend_renderer.c
++++ b/src/vrend_renderer.c
+@@ -1648,18 +1648,19 @@ int vrend_create_vertex_elements_state(struct vrend_context *ctx,
+                                        unsigned num_elements,
+                                        const struct pipe_vertex_element *elements)
+ {
+-   struct vrend_vertex_element_array *v = CALLOC_STRUCT(vrend_vertex_element_array);
++   struct vrend_vertex_element_array *v;
+    const struct util_format_description *desc;
+    GLenum type;
+    int i;
+    uint32_t ret_handle;
+ 
+-   if (!v)
+-      return ENOMEM;
+-
+    if (num_elements > PIPE_MAX_ATTRIBS)
+       return EINVAL;
+ 
++   v = CALLOC_STRUCT(vrend_vertex_element_array);
++   if (!v)
++      return ENOMEM;
++
+    v->count = num_elements;
+    for (i = 0; i < num_elements; i++) {
+       memcpy(&v->elements[i].base, &elements[i], sizeof(struct pipe_vertex_element));
+-- 
+cgit v0.10.2
+

gnu/packages/spice.scm

@@ -102,6 +102,7 @@
               (uri (string-append
                 "https://www.freedesktop.org/software/virgl/"
                 "virglrenderer-" version ".tar.bz2"))
+              (patches (search-patches "virglrenderer-CVE-2017-6386.patch"))
               (sha256
                (base32
                 "06kf0q4l52gzx5p63l8850hff8pmhp7xv1hk8zgx2apbw18y6jd5"))))