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));
-- 
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<tr><td><span title='2020-10-06 09:51:43 +0200'>2020-10-06</span></td><td><a href='/guix/commit/gnu/system/images?id=8a4f1eef98490827b331460d7432de843926869b'>images: Add pine64-barebones-raw-image.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-10-05 11:16:47 +0200'>2020-10-05</span></td><td><a href='/guix/commit/gnu/system/images?id=599954c1377a4fc8936f7f341a678ecb9579a2c6'>images: Add pine64 support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
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<tr><td><span title='2020-09-29 11:42:52 +0200'>2020-09-29</span></td><td><a href='/guix/commit/gnu/system/images?id=644cdc819fc6c49bbfcfa48d2d2cd52034862d2b'>images: hurd: Add hurd-barebones-qcow2-image.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-07-11 16:34:01 +0200'>2020-07-11</span></td><td><a href='/guix/commit/gnu/system/images?id=4b9eecd322e566783369795ebea63a479b51f486'>image: Do not set journal_model=WAL for the Hurd.</a><span class='msg-avail'>...</span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-06-25 22:52:12 +0200'>2020-06-25</span></td><td><a href='/guix/commit/gnu/system/images?id=2463a78d17673581978debff6c6c9fce7966980a'>image: hurd: Initialize root partition for the Hurd.</a><span class='msg-avail'>...</span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-06-25 22:52:09 +0200'>2020-06-25</span></td><td><a href='/guix/commit/gnu/system/images?id=fd932862ac4b464bd2642be114f73ee39c1ad64f'>image: hurd: Create hurd-compatible ext2 file-system.</a><span class='msg-avail'>...</span></td><td>Jan (janneke) Nieuwenhuizen</td></tr>
<tr><td><span title='2020-06-24 20:24:34 +0200'>2020-06-24</span></td><td><a href='/guix/commit/gnu/system/images?id=b904b59ce592c89dfb4675a8c06757afed6738a0'>image: Move hurd image definition to a dedicated file.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>