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 5FC77341A4 for ; Mon, 9 Oct 2023 13:48:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QcOC9DfB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D02F3C433C7; Mon, 9 Oct 2023 13:48:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696859296; bh=qyF+uiVNISqJB+4wetCHUMoeuTR33CU96RKFipLE/jo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QcOC9DfB4wQhacHmEXwpRj9KZSgo1G0EfbnHlbmxn0S+9ynInYMCy50+eilO/4nxY JP8sCFO+HV8CsaxZakPNwjag+X+xGuBZutwzzFtSlcokqGOgDm0kqH8wvvtYmqSjMT tVHms8LtVQx4oQasPBbn6Q/+MSQgG4Q6OFQ9HeAo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Budimir Markovic , Jamal Hadi Salim , Jakub Kicinski , Shaoying Xu Subject: [PATCH 4.14 33/55] net/sched: sch_hfsc: Ensure inner classes have fsc curve Date: Mon, 9 Oct 2023 15:06:32 +0200 Message-ID: <20231009130108.966422318@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130107.717692466@linuxfoundation.org> References: <20231009130107.717692466@linuxfoundation.org> User-Agent: quilt/0.67 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 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Budimir Markovic commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f upstream. HFSC assumes that inner classes have an fsc curve, but it is currently possible for classes without an fsc curve to become parents. This leads to bugs including a use-after-free. Don't allow non-root classes without HFSC_FSC to become parents. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: Budimir Markovic Signed-off-by: Budimir Markovic Acked-by: Jamal Hadi Salim Link: https://lore.kernel.org/r/20230824084905.422-1-markovicbudimir@gmail.com Signed-off-by: Jakub Kicinski [ v4.14: Delete NL_SET_ERR_MSG because extack is not added to hfsc_change_class ] Signed-off-by: Shaoying Xu Signed-off-by: Greg Kroah-Hartman --- net/sched/sch_hfsc.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -1020,6 +1020,8 @@ hfsc_change_class(struct Qdisc *sch, u32 if (parent == NULL) return -ENOENT; } + if (!(parent->cl_flags & HFSC_FSC) && parent != &q->root) + return -EINVAL; if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0) return -EINVAL;