netdev - Re: kernels > v4.12 oops/crash with ipsec-traffic: bisected to b838d5e1c5b6e57b10ec8af2268824041e3ea911: ipv4: mark DST_NOGC and remove the operation of dst

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Message-ID: <20180910090622.avunyp4agk4ueara@arbeitstier>
Date:   Mon, 10 Sep 2018 11:06:22 +0200
From:   Tobias Hommel <netdev-list@...oetigt.de>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Wolfgang Walter <linux@...m.de>, netdev@...r.kernel.org,
        Wei Wang <weiwan@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: kernels > v4.12 oops/crash with ipsec-traffic: bisected to
 b838d5e1c5b6e57b10ec8af2268824041e3ea911: ipv4: mark DST_NOGC and remove the
 operation of dst_free()

On Mon, Sep 10, 2018 at 08:37:39AM +0200, Steffen Klassert wrote:
...
> The other thing I wonder about is why Tobias bisected this to
> 
> commit b838d5e1c5b6e57b10ec8af2268824041e3ea911
> ipv4: mark DST_NOGC and remove the operation of dst_free()
> 
> from 'Jun 17 2017' and not to
> 
> commit 222d7dbd258dad4cd5241c43ef818141fad5a87a
> net: prevent dst uses after free
> 
> from 'Sep 21 2017'.
> 
> Maybe Tobias has seen two bugs. Before
> ("net: prevent dst uses after free"), it was the
> use after free, and after this fix it was a NULL
> pointer derference of skb->dst.
> 
Uhm, yeah, I checked back, we actually had different bugs. My mistake, sorry
for the confusion.