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    SubjectRe: [PATCH IPV6 1/1] ipv6: allocate enough headroom in ip6_finish_output2()
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    On 7/7/21 8:30 PM, Jakub Kicinski wrote:
    > On Wed, 7 Jul 2021 19:41:44 +0200 Eric Dumazet wrote:
    >> On 7/7/21 6:42 PM, Jakub Kicinski wrote:
    >>> On Wed, 7 Jul 2021 08:45:13 -0600 David Ahern wrote:
    >>>> why not use hh_len here?
    >>>
    >>> Is there a reason for the new skb? Why not pskb_expand_head()?
    >>
    >>
    >> pskb_expand_head() might crash, if skb is shared.
    >>
    >> We possibly can add a helper, factorizing all this,
    >> and eventually use pskb_expand_head() if safe.
    >
    > Is there a strategically placed skb_share_check() somewhere further
    > down? Otherwise there seems to be a lot of questionable skb_cow*()
    > calls, also __skb_linearize() and skb_pad() are risky, no?
    > Or is it that shared skbs are uncommon and syzbot doesn't hit them?
    >

    Some of us try hard to remove skb_get() occurrences,
    but they tend to re-appear fast :/

    Refs: commit a516993f0ac1694673412eb2d16a091eafa77d2a
    ("net: fix wrong skb_get() usage / crash in IGMP/MLD parsing code")

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