linux-kernel - Re: [PATCH v3] ip6mr: Fix skb_under_panic in ip6mr_cache

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Message-ID: <20230801191058.0664b1b8@kernel.org>
Date:   Tue, 1 Aug 2023 19:10:58 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>, <davem@...emloft.net>,
        <pabeni@...hat.com>, <yoshfuji@...ux-ipv6.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <simon.horman@...igine.com>
Subject: Re: [PATCH v3] ip6mr: Fix skb_under_panic in ip6mr_cache_report()

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).