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 D5BDD2E63B for ; Wed, 20 Sep 2023 12:11:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D59CC433C9; Wed, 20 Sep 2023 12:11:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695211879; bh=cDTqNZDWA7sZ/VDVxmyzwDlr3De/TV07evHm5JK40rg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VGB0d+duJaNZRGotZMTVbXnbOSIiFD0PF2LjQDan3hzR0y20/XWpA+QSW1toa7CRA DkH7bkrHpbkJNvSvBTqeMHMl+vfccvI0Q1NObO7t5ovw7vCntGjgqOoHRPAupOoqPr Sk4WIi5dShAo2TArzoUYT5qaVjYJEjUqBFbO+Ew8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Budimir Markovic , Jamal Hadi Salim , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.19 070/273] net/sched: sch_hfsc: Ensure inner classes have fsc curve Date: Wed, 20 Sep 2023 13:28:30 +0200 Message-ID: <20230920112848.627333794@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112846.440597133@linuxfoundation.org> References: <20230920112846.440597133@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 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Budimir Markovic [ Upstream commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f ] 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 Signed-off-by: Sasha Levin --- net/sched/sch_hfsc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c index b18ec1f6de60c..fa3d2fd4990ce 100644 --- a/net/sched/sch_hfsc.c +++ b/net/sched/sch_hfsc.c @@ -1021,6 +1021,10 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, if (parent == NULL) return -ENOENT; } + if (!(parent->cl_flags & HFSC_FSC) && parent != &q->root) { + NL_SET_ERR_MSG(extack, "Invalid parent - parent class must have FSC"); + return -EINVAL; + } if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0) return -EINVAL; -- 2.40.1