[SRU][J/F][PATCH 0/1] CVE-2024-36901

[Chris Chiu]

On Tue, Jul 9, 2024 at 9:03 AM Vinicius Peixoto
<vinicius.peixoto at canonical.com> wrote:
>
> [Impact]
> According to syzbot, there is a chance that ip6_dst_idev()
> returns NULL in ip6_output(). Most places in IPv6 stack
> deal with a NULL idev just fine, but not here.
>
> [Backport]
> Due to the lack of upstream commit
> 5e187189ec324f78035d33a4bc123a9c4ca6f3e3 ("net: ip: add skb drop reasons for ip egress path)"
> Jammy, Focal, Bionic and Xenial had a context conflict.
> Xenial is also missing 97a7a37a7b7b ("ipv6: Initial skb->dev and skb->protocol in ip6_output").
> However, none of those commits directly impact the fix or the issue,
> so a manual backport is appropriate here.
>
> [Test]
> Compile tested.
>
> [Where problems could occur]
> Any issues here would directly impact IPv6 networking.
>
> Eric Dumazet (1):
>   ipv6: prevent NULL dereference in ip6_output()
>
>  net/ipv6/ip6_output.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> --
> 2.43.0
>
>
> --
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Acked-by: Chris Chiu <chris.chiu at canonical.com>