CVE-2025-38162

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

netfilter: nft_set_pipapo: prevent overflow in lookup table allocation

When calculating the lookup table size, ensure the following

multiplication does not overflow:

- desc->field_len[] maximum value is U8_MAX multiplied by

NFT_PIPAPO_GROUPS_PER_BYTE(f) that can be 2, worst case.

- NFT_PIPAPO_BUCKETS(f->bb) is 2^8, worst case.

- sizeof(unsigned long), from sizeof(*f->lt), lt in

struct nft_pipapo_field.

Then, use check_mul_overflow() to multiply by bucket size and then use

check_add_overflow() to the alignment for avx2 (if needed). Finally, add

lt_size_check_overflow() helper and use it to consolidate this.

While at it, replace leftover allocation using the GFP_KERNEL to

GFP_KERNEL_ACCOUNT for consistency, in pipapo_resize().