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 38FFE16428 for ; Wed, 9 Aug 2023 10:58:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEF83C433C8; Wed, 9 Aug 2023 10:58:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691578725; bh=onMj7kt9U2/6s1TDbAInmAflC2itUQCsqoPgcfp7kx8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QFmaGYMm/RUKUdZFE0deEP4xHNfCcxAUrinHf/Et5yNsacXFQ3X0sHWF42dBAuM+Y svSworw8RTdjWMjvBX2cv4rfRuEf9XEKmH4u3UsexVrpubUgpF3Azm+F8URoboWLlD 8bEWKSTd9JTH/UrFP5Sn70KJHqXJv20+7TLYpaFQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, valis , Bing-Jhong Billy Jheng , Jamal Hadi Salim , Victor Nogueira , Pedro Tammela , M A Ramdhan , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 35/92] net/sched: cls_route: No longer copy tcf_result on update to avoid use-after-free Date: Wed, 9 Aug 2023 12:41:11 +0200 Message-ID: <20230809103634.827989306@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103633.485906560@linuxfoundation.org> References: <20230809103633.485906560@linuxfoundation.org> User-Agent: quilt/0.67 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 From: valis [ Upstream commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8 ] When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. Fix this by no longer copying the tcf_result struct from the old filter. Fixes: 1109c00547fc ("net: sched: RCU cls_route") Reported-by: valis Reported-by: Bing-Jhong Billy Jheng Signed-off-by: valis Signed-off-by: Jamal Hadi Salim Reviewed-by: Victor Nogueira Reviewed-by: Pedro Tammela Reviewed-by: M A Ramdhan Link: https://lore.kernel.org/r/20230729123202.72406-4-jhs@mojatatu.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sched/cls_route.c | 1 - 1 file changed, 1 deletion(-) diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c index 48712bc51bda7..194468d0355a1 100644 --- a/net/sched/cls_route.c +++ b/net/sched/cls_route.c @@ -511,7 +511,6 @@ static int route4_change(struct net *net, struct sk_buff *in_skb, if (fold) { f->id = fold->id; f->iif = fold->iif; - f->res = fold->res; f->handle = fold->handle; f->tp = fold->tp; -- 2.40.1