Re: [PATCH net] net/xen-netback: prevent UAF in xenvif_flush_hash()

[Paolo Abeni <pabeni@xxxxxxxxxx>]

On 8/22/24 20:11, Jeongjun Park wrote:
> During the list_for_each_entry_rcu iteration call of xenvif_flush_hash,
> kfree_rcu does not exist inside the rcu read critical section, so if
The above wording is confusing, do you mean "kfree_rcu does not exit 
from "...?
> kfree_rcu is called when the rcu grace period ends during the iteration,
> UAF occurs when accessing head->next after the entry becomes free.
The loop runs with irq disabled, the RCU critical section extends over 
it, uninterrupted.
Do you have a splat for the reported UAF?

This does not look the correct solution.

Thanks,

Paolo