File 0289-9pfs-fix-information-leak-in-xattr-.patch of Package qemu.4227

From 9a98e5f29d26b076045964981daec9da326a7af9 Mon Sep 17 00:00:00 2001
From: Li Qiang <liqiang6-s@360.cn>
Date: Mon, 17 Oct 2016 14:13:58 +0200
Subject: [PATCH] 9pfs: fix information leak in xattr read

9pfs uses g_malloc() to allocate the xattr memory space, if the guest
reads this memory before writing to it, this will leak host heap memory
to the guest. This patch avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Greg Kurz <groug@kaod.org>
(cherry picked from commit eb687602853b4ae656e9236ee4222609f3a6887d)
[BR: CVE-2016-9103 BSC#1007454]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/9pfs/virtio-9p.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index 39b841b22b..5067d7dc62 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -3134,7 +3134,7 @@ static void v9fs_xattrcreate(void *opaque)
     xattr_fidp->fs.xattr.flags = flags;
     v9fs_string_init(&xattr_fidp->fs.xattr.name);
     v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
-    xattr_fidp->fs.xattr.value = g_malloc(size);
+    xattr_fidp->fs.xattr.value = g_malloc0(size);
     err = offset;
     put_fid(pdu, file_fidp);
 out_nofid: