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Date:   Sun, 08 Mar 2020 21:26:26 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] gre: fix uninit-value in __iptunnel_pull_header

From: Eric Dumazet <>
Date: Sat,  7 Mar 2020 22:05:14 -0800

> syzbot found an interesting case of the kernel reading
> an uninit-value [1]
> Problem is in the handling of ETH_P_WCCP in gre_parse_header()
> We look at the byte following GRE options to eventually decide
> if the options are four bytes longer.
> Use skb_header_pointer() to not pull bytes if we found
> that no more bytes were needed.
> All callers of gre_parse_header() are properly using pskb_may_pull()
> anyway before proceeding to next header.
> [1]
> Fixes: 95f5c64c3c13 ("gre: Move utility functions to common headers")
> Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.")
> Signed-off-by: Eric Dumazet <>
> Reported-by: syzbot <>

Applied and queued up for -stable, thanks.

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