Re: [PATCH v6.1.y 4/4] ipv4: start using dst_dev_rcu()

[Greg KH]

On Fri, Aug 21, 2026 at 03:33:38PM +0200, Miguel Gazquez (Schneider Electric) wrote:
> From: Eric Dumazet <edumazet@xxxxxxxxxx>
> 
> [ Upstream commit 6ad8de3cefdb6ffa6708b21c567df0dbf82c43a8 ]
> 
> Change icmpv4_xrlim_allow(), ip_defrag() to prevent possible UAF.
> 
> Change ipmr_prepare_xmit(), ipmr_queue_fwd_xmit(), ip_mr_output(),
> ipv4_neigh_lookup() to use lockdep enabled dst_dev_rcu().
> 
> Fixes: 4a6ce2b6f2ec ("net: introduce a new function dst_dev_put()")
> Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
> Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
> Link: https://patch.msgid.link/20250828195823.3958522-9-edumazet@xxxxxxxxxx
> Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
> [ minor modifications to fix conflict, added rcu_read_lock and unlock
> to ip_defrag function ]
> Signed-off-by: Miguel Gazquez (Schneider Electric) <miguel.gazquez@xxxxxxxxxxx>

We need a working 6.6.y version first, before we can take this one.

thanks,

greg k-h