Re: [PATCH] openvswitch: Change the return type for vport_ops.send function hook to int

Eelco Chaudron
2022-09-19T13:21:08Z

On 14 Sep 2022, at 1:07, 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@gmail.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1703
> Cc: llvm@lists.linux.dev
> Signed-off-by: Nathan Huckleberry <nhuck@google.com>

The changes look good to me.

Acked-by: Eelco Chaudron <echaudro@redhat.com>