CVE-2026-72252: netfilter: nft_set_pipapo: don't leak bad clone into future transaction

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nftsetpipapo: don't leak bad clone into future transaction

On memory allocation failure the cloned nftpipapomatch can enter a bad state: - some fields can have their lookup tables resized while others did not - bits might have been toggled - scratch map can be undersized which also means m->bsizemax can be lower than what is required

This means that the next insertion in the same batch can trigger out-of-bounds writes.

Furthermore, a failure in the first can result in the bad clone to leak into the next transaction because the abort callback is never executed in this case (the upper layer saw an error and no attempt to allocate a transactional request was made).

Record a state for the nftpipapomatch structure: - NEW (pristine clone) - MOD (modified clone with good state) - ERR (potentially bogus content)

Then make it so that deletes and insertions fail when the clone entered ERR state.

In case the very first insert attempt results in an error, free the clone right away.