From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9260C848C for ; Fri, 10 Mar 2023 14:21:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8FA6C433EF; Fri, 10 Mar 2023 14:21:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678458073; bh=B2OdWDeAIeLomM8j4XUxO5pa8Bv/4raKs5njJgC/nqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gPkLoXYjvfMm6Gje9rljcxBNNH3ooaPd1p8Ke8OJz2PkUvvRdpcA2I745zPBAvuOo q1ohTImZxgNOEtBs4dhRt55UV2C2PkvNQA1rQNPe7bAFkrJ7aEFU4x5abqiz+QS/gi NkfGmy1Qzcr+s4uew6692JqUA71nttW76Z0MAD/4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pietro Borrello , Kuniyuki Iwashima , Eric Dumazet , Paolo Abeni , Sasha Levin Subject: [PATCH 4.19 123/252] inet: fix fast path in __inet_hash_connect() Date: Fri, 10 Mar 2023 14:38:13 +0100 Message-Id: <20230310133722.520707141@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.803482157@linuxfoundation.org> References: <20230310133718.803482157@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pietro Borrello [ Upstream commit 21cbd90a6fab7123905386985e3e4a80236b8714 ] __inet_hash_connect() has a fast path taken if sk_head(&tb->owners) is equal to the sk parameter. sk_head() returns the hlist_entry() with respect to the sk_node field. However entries in the tb->owners list are inserted with respect to the sk_bind_node field with sk_add_bind_node(). Thus the check would never pass and the fast path never execute. This fast path has never been executed or tested as this bug seems to be present since commit 1da177e4c3f4 ("Linux-2.6.12-rc2"), thus remove it to reduce code complexity. Signed-off-by: Pietro Borrello Reviewed-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Link: https://lore.kernel.org/r/20230112-inet_hash_connect_bind_head-v3-1-b591fd212b93@diag.uniroma1.it Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/ipv4/inet_hashtables.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index d64522af9c3a8..5a272d09b8248 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -756,17 +756,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, u32 index; if (port) { - head = &hinfo->bhash[inet_bhashfn(net, port, - hinfo->bhash_size)]; - tb = inet_csk(sk)->icsk_bind_hash; - spin_lock_bh(&head->lock); - if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { - inet_ehash_nolisten(sk, NULL, NULL); - spin_unlock_bh(&head->lock); - return 0; - } - spin_unlock(&head->lock); - /* No definite answer... Walk to established hash table */ + local_bh_disable(); ret = check_established(death_row, sk, port, NULL); local_bh_enable(); return ret; -- 2.39.2