Subject: Re: [PATCH v3] ip6mr: Fix skb_under_panic in ip6mr_cache_report()

From: Jakub Kicinski <[email-masked]>
Date: Tue, 1 Aug 2023 19:10:58 -0700

On Wed, 2 Aug 2023 09:28:31 +0800 YueHaibing wrote:
> > that pattern shows up a few times:  
> 
> Ok, I will test and fix these if any.

Thanks, we may also want to add a 
  DEBUG_NET_WARN_ON_ONCE(len > INT_MAX)
in skb_push() but perhaps that's an overkill.
Most of those cases are probably legit (skb_.*_offset()
can well be negative if headers were already pulled).