Vulnerability CVE-2022-48643
Published: 2024-04-28

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

netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain()

syzbot is reporting underflow of nft_counters_enabled counter at
nf_tables_addchain() [1], for commit 43eb8949cfdffa76 ("netfilter:
nf_tables: do not leave chain stats enabled on error") missed that
nf_tables_chain_destroy() after nft_basechain_init() in the error path of
nf_tables_addchain() decrements the counter because nft_basechain_init()
makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag.

Increment the counter immediately after returning from
nft_basechain_init().

 References:
https://git.kernel.org/stable/c/710e3f526bd23a0d33435dedc52c3144de284378
https://git.kernel.org/stable/c/91aa52652f4b37089aff3cb53e83049d826fef6d
https://git.kernel.org/stable/c/8bcad2a931313aeba076b76922d5813ef97d0a91
https://git.kernel.org/stable/c/921ebde3c0d22c8cba74ce8eb3cc4626abff1ccd
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