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netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()
[ Upstream commit f969eb84ce482331a991079ab7a5c4dc3b7f89bf ] nft_unregister_expr() can concurrent with __nft_expr_type_get(), and there is not any protection when iterate over nf_tables_expressions list in __nft_expr_type_get(). Therefore, there is potential data-race of nf_tables_expressions list entry. Use list_for_each_entry_rcu() to iterate over nf_tables_expressions list in __nft_expr_type_get(), and use rcu_read_lock() in the caller nft_expr_type_get() to protect the entire type query process. Fixes: ef1f7df ("netfilter: nf_tables: expression ops overloading") Signed-off-by: Ziyang Xuan <[email protected]> Signed-off-by: Pablo Neira Ayuso <[email protected]> Signed-off-by: Sasha Levin <[email protected]> (cherry picked from commit 939109c0a8e2a006a6cc8209e262d25065f4403a) Signed-off-by: Vegard Nossum <[email protected]>
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