From: Willem de Bruijn <willemdebruijn.ker...@gmail.com>
Date: Sat, 24 Nov 2018 14:21:16 -0500
> From: Willem de Bruijn <will...@google.com>
>
> In ip packet generation, pagedlen is initialized for each skb at the
> start of the loop in __ip(6)_append_data, before label alloc_new_skb.
>
> Depending on compiler options, code can be generated that jumps to
> this label, triggering use of an an uninitialized variable.
>
> In practice, at -O2, the generated code moves the initialization below
> the label. But the code should not rely on that for correctness.
>
> Fixes: 15e36f5b8e98 ("udp: paged allocation with gso")
> Signed-off-by: Willem de Bruijn <will...@google.com>
>
> ---
>
> Noticed when rebasing udp zerocopy. I considered merging as part of
> that patchset, but this seemed like it should go to net, even if it
> does not trigger in practice.
>
> Merged net with this patch onto net-next with udp zerocopy to verify
> that there is no merge conflict.
Ok, applied, but not queued for -stable.
Let me know if I should -stable this.
