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)

---

 hw/9pfs/9p.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c

index 856544d..0735246 100644

--- a/hw/9pfs/9p.c

+++ b/hw/9pfs/9p.c

@@ -3259,7 +3259,7 @@ 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: