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 EA8352E0412; Tue, 11 Nov 2025 01:42:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762825377; cv=none; b=dcbtQo2gsbW9dmMNpTTj5YRQfvhVRjWrH8+e+lpTNL6O3UDmW2TiTrfrIsQMEeSbFrLAzx+n+/J99QCzpq6it2ocqoOZC8V1efwodjhl+wFmXtcaOjQrtlnGd1GZRVmLfIRh5GcE6enZtsLi8oTKH4i+bjsEBfbUb7bBCYyrU90= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762825377; c=relaxed/simple; bh=OsIdxEayijNObFY3oM2KI/sfAtnPoB5ktOUpbAGX6qI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=itZwSMKSLlaDUpmjQhV3Db/wuJNQ5mywAlnfVG6Us2mq17k1vyxrMojpl3NDhaUI7R4RLASWfAxbrY0q0AEeBWHJF7G6Ke5pKDs/YM9nZ5MLFBmyxwVAxP65eVFUQK15TNZZyQWG53YDcjhjnVCKOIvhpVmq2ha3ATsndf47+qM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=guaAi4ww; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="guaAi4ww" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 452BBC116D0; Tue, 11 Nov 2025 01:42:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1762825376; bh=OsIdxEayijNObFY3oM2KI/sfAtnPoB5ktOUpbAGX6qI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=guaAi4wwPnQkoWJeq0R5DhQwBgflsxGLtdegrXJ7FgPwI+LFtt18TLG2ZE33L9+HP xeirSyfhvU4mkT/scFgh2WiioIGYZ9slIoAswIHtdjkU4IYEG9gnxQJ0MzrwGuKhfA 874gW1DVcK+M97R/UUf62JxFkmOlhihXWKusmgro= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xin Long , Stefan Wiehler , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.17 776/849] sctp: Hold sock lock while iterating over address list Date: Tue, 11 Nov 2025 09:45:46 +0900 Message-ID: <20251111004555.187997083@linuxfoundation.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251111004536.460310036@linuxfoundation.org> References: <20251111004536.460310036@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Wiehler [ Upstream commit f1fc201148c7e684c10a72b6a3375597f28d1ef6 ] Move address list traversal in inet_assoc_attr_size() under the sock lock to avoid holding the RCU read lock. Suggested-by: Xin Long Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file") Signed-off-by: Stefan Wiehler Acked-by: Xin Long Link: https://patch.msgid.link/20251028161506.3294376-4-stefan.wiehler@nokia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sctp/diag.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/net/sctp/diag.c b/net/sctp/diag.c index 95e65b9d623b3..5a43f25478d03 100644 --- a/net/sctp/diag.c +++ b/net/sctp/diag.c @@ -230,14 +230,15 @@ struct sctp_comm_param { bool net_admin; }; -static size_t inet_assoc_attr_size(struct sctp_association *asoc) +static size_t inet_assoc_attr_size(struct sock *sk, + struct sctp_association *asoc) { int addrlen = sizeof(struct sockaddr_storage); int addrcnt = 0; struct sctp_sockaddr_entry *laddr; list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list, - list) + list, lockdep_sock_is_held(sk)) addrcnt++; return nla_total_size(sizeof(struct sctp_info)) @@ -263,11 +264,14 @@ static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *t if (err) return err; - rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL); - if (!rep) + lock_sock(sk); + + rep = nlmsg_new(inet_assoc_attr_size(sk, assoc), GFP_KERNEL); + if (!rep) { + release_sock(sk); return -ENOMEM; + } - lock_sock(sk); if (ep != assoc->ep) { err = -EAGAIN; goto out; -- 2.51.0