On Wed, 28 Sep 2016 14:42:05 +0800 Li Qiang <liq...@gmail.com> wrote:
> Hi Greg, > > What about this patch? > > It seems you have forget it. > Heh not exactly... I'm just wondering why we allocate xattr_fidp->fs.xattr.value here if we don't use it. Can you please investigate if it is possible to defer allocation until it is really needed ? Thanks. -- Greg > 2016-09-27 12:44 GMT+08:00 Li Qiang <liq...@gmail.com>: > > > From: Li Qiang <liqiang...@360.cn> > > > > 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 <liqiang...@360.cn> > > --- > > 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 b1ff8e7..4db1bd8 100644 > > --- a/hw/9pfs/9p.c > > +++ b/hw/9pfs/9p.c > > @@ -3291,7 +3291,7 @@ 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: > > -- > > 1.8.3.1 > > > >
