Re: [PATCH] [net/ipv6] ip6_output: Add ipv6_pinfo null check

From: Cong Wang
Date: Mon Jul 27 2020 - 23:13:07 EST

On Mon, Jul 27, 2020 at 7:14 PM Gaurav Singh <gaurav1086@xxxxxxxxx> wrote:
> Add return to fix build issue. Haven't reproduced this issue at
> my end.
> My hypothesis is this: In function: ip6_xmit(), we have
> const struct ipv6_pinfo *np = inet6_sk(sk); which returns NULL.
> Further down the function, there's a check:
> if (np) hlimit = hp->htop_limit

This check exists before git history, at that time 'sk' could be NULL,
hence 'np', so it does not mean it is still necessary now.

I looked at all callers of ip6_xmit(), I don't see how it is called with
a non-full socket, neither 'sk' could be NULL after
commit b30bd282cbf5c46247a279a2e8d2aae027d9f1bf
("[IPV6]: ip6_xmit: remove unnecessary NULL ptr check").