> Hello! > > On 3/18/2017 3:58 PM, Elena Reshetova wrote: > > > refcount_t type and corresponding API should be > > used instead of atomic_t when the variable is used as > > a reference counter. This allows to avoid accidental > > refcounter overflows that might lead to use-after-free > > situations. > > > > Signed-off-by: Elena Reshetova <elena.reshet...@intel.com> > > Signed-off-by: Hans Liljestrand <ishkam...@gmail.com> > > Signed-off-by: Kees Cook <keesc...@chromium.org> > > Signed-off-by: David Windsor <dwind...@gmail.com> > [...] > > diff --git a/net/core/filter.c b/net/core/filter.c > > index ebaeaf2..62267e2 100644 > > --- a/net/core/filter.c > > +++ b/net/core/filter.c > [...] > > @@ -1179,12 +1179,13 @@ static int __sk_attach_prog(struct bpf_prog *prog, > struct sock *sk) > > return -ENOMEM; > > > > fp->prog = prog; > > - atomic_set(&fp->refcnt, 0); > > + refcount_set(&fp->refcnt, 1); > > > > if (!sk_filter_charge(sk, fp)) { > > kfree(fp); > > return -ENOMEM; > > } > > + refcount_set(&fp->refcnt, 1); > > Why do it twice? > > [...] > > MBR, Sergei
Sorry I just realized that I had unsquashed changes when I sent this patch, so this is still the old version. Will send a new one now. Best Regards, Elena.