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 00865282E1; Tue, 12 Aug 2025 18:02:31 +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=1755021752; cv=none; b=k0qCxEyGDO7PSSmCMHRouhBvl43GpQNZH3HLOyguXoQ7olee+1LMUJVu8JWO1/ZPUlr8GAvAqiHlPS0SBjvu4PyUvbpKnr77ld6npb22HaODSsbdKPeqhYVMj0NFmyCc7GVwvKLQwEIcHq2Rs5wmbGresuuqpLR063xwbtkHN58= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755021752; c=relaxed/simple; bh=fus9dX9dGf1C8lDD86NA3W6qndtDcsrD9ny9mY0YkHk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=s8r6PY9JrfKhxhAARTuwEf+Z9Mg8TwUYb9nu1kP8wS9xiDsQglHEW8JApQ2ivrrC4WnvXasTr8HoFnNi3fLUBlkGBjTbf3EiHrIYlR2u0F456x9DnOZL8G1Qxo8u6YJDUBIQBHX6OBKOVXJClgc9dRYKZuCgWKL1eFhO5fpwYJ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OuPn97BU; 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="OuPn97BU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 506DAC4CEF0; Tue, 12 Aug 2025 18:02:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755021751; bh=fus9dX9dGf1C8lDD86NA3W6qndtDcsrD9ny9mY0YkHk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OuPn97BUa3h8OHsbtKCeEMQPOHreYE8SxcyWP72dGKvTpEUjgJ0syICDMrOwnkqf9 1l/IVsn+fwKjdZHn7/vqgFxkJDFS41zPDJtin3CsNqFAMlNZItfTCYFF9yZaM96AmL qbbAnMdWF6BOQNjd6n1Z0+v1Gk9r0YtzeY5l+CQs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Maher Azzouzi , Vladimir Oltean , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.6 214/262] net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing Date: Tue, 12 Aug 2025 19:30:02 +0200 Message-ID: <20250812173002.259375033@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812172952.959106058@linuxfoundation.org> References: <20250812172952.959106058@linuxfoundation.org> User-Agent: quilt/0.68 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maher Azzouzi [ Upstream commit ffd2dc4c6c49ff4f1e5d34e454a6a55608104c17 ] TCA_MQPRIO_TC_ENTRY_INDEX is validated using NLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value TC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack write in the fp[] array, which only has room for 16 elements (0–15). Fix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1. Fixes: f62af20bed2d ("net/sched: mqprio: allow per-TC user input of FP adminStatus") Reviewed-by: Eric Dumazet Signed-off-by: Maher Azzouzi Reviewed-by: Vladimir Oltean Link: https://patch.msgid.link/20250802001857.2702497-1-kuba@kernel.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sched/sch_mqprio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c index 793009f445c0..a0e3f3bae536 100644 --- a/net/sched/sch_mqprio.c +++ b/net/sched/sch_mqprio.c @@ -152,7 +152,7 @@ static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt, static const struct nla_policy mqprio_tc_entry_policy[TCA_MQPRIO_TC_ENTRY_MAX + 1] = { [TCA_MQPRIO_TC_ENTRY_INDEX] = NLA_POLICY_MAX(NLA_U32, - TC_QOPT_MAX_QUEUE), + TC_QOPT_MAX_QUEUE - 1), [TCA_MQPRIO_TC_ENTRY_FP] = NLA_POLICY_RANGE(NLA_U32, TC_FP_EXPRESS, TC_FP_PREEMPTIBLE), -- 2.39.5