Author: Li Qiang <liqiang6-s@360.cn>
Date:   Mon Oct 17 14:13:58 2016 +0200

    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>

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 26aa7d5..bf23b01 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3269,8 +3269,8 @@ static void coroutine_fn 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);
     g_free(xattr_fidp->fs.xattr.value);
-    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: