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Message-ID: <YyERjpSlz+MVCULd@dev-arch.thelio-3990X> Date: Tue, 13 Sep 2022 16:26:06 -0700 From: Nathan Chancellor <nathan@...nel.org> To: Nathan Huckleberry <nhuck@...gle.com> Cc: Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev, Pravin B Shelar <pshelar@....org>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, netdev@...r.kernel.org, dev@...nvswitch.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] openvswitch: Change the return type for vport_ops.send function hook to int On Tue, Sep 13, 2022 at 04:07:38PM -0700, Nathan Huckleberry wrote: > All usages of the vport_ops struct have the .send field set to > dev_queue_xmit or internal_dev_recv. Since most usages are set to > dev_queue_xmit, the function hook should match the signature of > dev_queue_xmit. > > The only call to vport_ops->send() is in net/openvswitch/vport.c and it > throws away the return value. > > This mismatched return type breaks forward edge kCFI since the underlying > function definition does not match the function hook definition. > > Reported-by: Dan Carpenter <error27@...il.com> > Link: https://github.com/ClangBuiltLinux/linux/issues/1703 > Cc: llvm@...ts.linux.dev > Signed-off-by: Nathan Huckleberry <nhuck@...gle.com> Reviewed-by: Nathan Chancellor <nathan@...nel.org> > --- > net/openvswitch/vport-internal_dev.c | 2 +- > net/openvswitch/vport.h | 2 +- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c > index 35f42c9821c2..74c88a6baa43 100644 > --- a/net/openvswitch/vport-internal_dev.c > +++ b/net/openvswitch/vport-internal_dev.c > @@ -190,7 +190,7 @@ static void internal_dev_destroy(struct vport *vport) > rtnl_unlock(); > } > > -static netdev_tx_t internal_dev_recv(struct sk_buff *skb) > +static int internal_dev_recv(struct sk_buff *skb) > { > struct net_device *netdev = skb->dev; > > diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h > index 7d276f60c000..6ff45e8a0868 100644 > --- a/net/openvswitch/vport.h > +++ b/net/openvswitch/vport.h > @@ -132,7 +132,7 @@ struct vport_ops { > int (*set_options)(struct vport *, struct nlattr *); > int (*get_options)(const struct vport *, struct sk_buff *); > > - netdev_tx_t (*send) (struct sk_buff *skb); > + int (*send)(struct sk_buff *skb); > struct module *owner; > struct list_head list; > }; > -- > 2.37.2.789.g6183377224-goog >
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