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 7512325A64C; Tue, 11 Nov 2025 01:33:43 +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=1762824823; cv=none; b=CSULlb32iYYW+O0xD/TnDkwfA7f5PJKTWHBNdQCHzmnV+V4t+bv3A8BasAs40JugDnRy+k8OTe1MaWBOLojkufy/Nsyn8hEjv7Y5v2i+enFwfk9Imx4zuyH/WwCcsj3vTxa9p7cQAJkKiTGipqP879k2cT9s7iAd6v1DogPwRvY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762824823; c=relaxed/simple; bh=8BqeE5KFvSJa+7Q1AtBU3w1YW6hbmyysRSBaEzzPIHs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WIaNbsW/kGiPacgYd8435I7k9LQDrnSs7bZ1iLu27To48iZIxCgM6Pe/aBzahoneM6rDnsutgFI1ad+U0UTC79KAaSHc/jdQHIU+HJS/cJOFQ65udy0iBFJb1fEwTv51yJqWWkEFNtCEsNAZ1KBVR+Ku3n3KhvkxwP4tTQQYDP8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=v3T+mYGQ; 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="v3T+mYGQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1564AC116B1; Tue, 11 Nov 2025 01:33:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1762824823; bh=8BqeE5KFvSJa+7Q1AtBU3w1YW6hbmyysRSBaEzzPIHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v3T+mYGQTtNuZTxn3vW56MLQ0D+LBcTWk/q8/BHpkCI1HJnqAZFylxx6S1Yphqxri aGF0p220i1CyBojHrK7TINxXI+F+Mlo/EYHm4KJU6hqI+QopJMoz7MSVI5QtYOxPOH uFjqMeznhUEaUCsUB7HJlUniGyVdwE+x68zEibxg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kuniyuki Iwashima , Stefan Wiehler , Xin Long , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12 524/565] sctp: Prevent TOCTOU out-of-bounds write Date: Tue, 11 Nov 2025 09:46:20 +0900 Message-ID: <20251111004538.752125999@linuxfoundation.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251111004526.816196597@linuxfoundation.org> References: <20251111004526.816196597@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Wiehler [ Upstream commit 95aef86ab231f047bb8085c70666059b58f53c09 ] For the following path not holding the sock lock, sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump() make sure not to exceed bounds in case the address list has grown between buffer allocation (time-of-check) and write (time-of-use). Suggested-by: Kuniyuki Iwashima Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file") Signed-off-by: Stefan Wiehler Reviewed-by: Kuniyuki Iwashima Acked-by: Xin Long Link: https://patch.msgid.link/20251028161506.3294376-3-stefan.wiehler@nokia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sctp/diag.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/sctp/diag.c b/net/sctp/diag.c index dadf8254b30fd..95e65b9d623b3 100644 --- a/net/sctp/diag.c +++ b/net/sctp/diag.c @@ -88,6 +88,9 @@ static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb, memcpy(info, &laddr->a, sizeof(laddr->a)); memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a)); info += addrlen; + + if (!--addrcnt) + break; } rcu_read_unlock(); -- 2.51.0