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Message-ID: <YzF8cdiKQKG9l73k@kadam> Date: Mon, 26 Sep 2022 13:18:25 +0300 From: Dan Carpenter <dan.carpenter@...cle.com> To: Jamal Hadi Salim <jhs@...atatu.com> Cc: syzbot <syzbot+a2c4601efc75848ba321@...kaller.appspotmail.com>, davem@...emloft.net, edumazet@...gle.com, jiri@...nulli.us, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com Subject: Re: [syzbot] WARNING in u32_change On Sun, Sep 25, 2022 at 12:14:44PM -0400, Jamal Hadi Salim wrote: > On Sun, Sep 25, 2022 at 11:38 AM Jamal Hadi Salim <jhs@...atatu.com> wrote: > > > > Is there a way to tell the boat "looking into it?" > > > I guess I have to swim across to it to get the message;-> > > I couldnt see the warning message but it is obvious by inspection that > the memcpy is broken. We should add more test coverage. > This should fix it. Will send a formal patch later: > > diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c > index 4d27300c2..591cbbf27 100644 > --- a/net/sched/cls_u32.c > +++ b/net/sched/cls_u32.c > @@ -1019,7 +1019,7 @@ static int u32_change(struct net *net, struct > sk_buff *in_skb, > } > > s = nla_data(tb[TCA_U32_SEL]); > - sel_size = struct_size(s, keys, s->nkeys); > + sel_size = struct_size(s, keys, s->nkeys) + sizeof(n->sel); Smatch will soon start complaining about these. Can we instead do: sel_size = size_add(struct_size(s, keys, s->nkeys), sizeof(n->sel)); Probably eventually Smatch will be able to detect some times when struct_size() is used for readability and not for safety so maybe it won't warn... regards, dan carpenter
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