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 E65D515C8B for ; Mon, 5 Dec 2022 19:44:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 62D4BC433C1; Mon, 5 Dec 2022 19:44:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670269472; bh=DZe4cbtR0ookrs+Ji5JYi1AJmCbg5jrRdGx4NXD3veY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XaZRObH1/Uwde2q5cBXzHnepRM6P3QIrAyd7zc8VQJ8UsC/8SV6Zlx8u6+RxMx+I/ yyOCEVmMQ9seX9gfdw5TAb+k2Nnwbp3Ia7E/3UUQ9dq99M1ttxMMJCczwPn909WTeh oKghkeWvyjKxg75LvKGt8Y6CGBOEkf422FHYDj64= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Gwangun Jung , David Ahern , Ido Schimmel , "David S. Miller" , Sasha Levin Subject: [PATCH 5.4 139/153] ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference Date: Mon, 5 Dec 2022 20:11:03 +0100 Message-Id: <20221205190812.624269613@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190808.733996403@linuxfoundation.org> References: <20221205190808.733996403@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: David Ahern [ Upstream commit 61b91eb33a69c3be11b259c5ea484505cd79f883 ] Gwangun Jung reported a slab-out-of-bounds access in fib_nh_match: fib_nh_match+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fib_semantics.c:961 fib_table_delete+0x5f3/0xa40 linux-6.0-rc7/net/ipv4/fib_trie.c:1753 inet_rtm_delroute+0x2b3/0x380 linux-6.0-rc7/net/ipv4/fib_frontend.c:874 Separate nexthop objects are mutually exclusive with the legacy multipath spec. Fix fib_nh_match to return if the config for the to be deleted route contains a multipath spec while the fib_info is using a nexthop object. Fixes: 493ced1ac47c ("ipv4: Allow routes to use nexthop objects") Fixes: 6bf92d70e690 ("net: ipv4: fix route with nexthop object delete warning") Reported-by: Gwangun Jung Signed-off-by: David Ahern Reviewed-by: Ido Schimmel Tested-by: Ido Schimmel Signed-off-by: David S. Miller Stable-dep-of: d5082d386eee ("ipv4: Fix route deletion when nexthop info is not specified") Signed-off-by: Sasha Levin --- net/ipv4/fib_semantics.c | 8 ++++---- tools/testing/selftests/net/fib_nexthops.sh | 5 +++++ 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 28da0443f3e9..31424172ff18 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -875,13 +875,13 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi, return 1; } + /* cannot match on nexthop object attributes */ + if (fi->nh) + return 1; + if (cfg->fc_oif || cfg->fc_gw_family) { struct fib_nh *nh; - /* cannot match on nexthop object attributes */ - if (fi->nh) - return 1; - nh = fib_info_nh(fi, 0); if (cfg->fc_encap) { if (fib_encap_match(cfg->fc_encap_type, cfg->fc_encap, diff --git a/tools/testing/selftests/net/fib_nexthops.sh b/tools/testing/selftests/net/fib_nexthops.sh index 7b154b61d108..28f5121fac44 100755 --- a/tools/testing/selftests/net/fib_nexthops.sh +++ b/tools/testing/selftests/net/fib_nexthops.sh @@ -597,6 +597,11 @@ ipv4_fcnal() log_test $rc 0 "Delete nexthop route warning" run_cmd "$IP route delete 172.16.101.1/32 nhid 12" run_cmd "$IP nexthop del id 12" + + run_cmd "$IP nexthop add id 21 via 172.16.1.6 dev veth1" + run_cmd "$IP ro add 172.16.101.0/24 nhid 21" + run_cmd "$IP ro del 172.16.101.0/24 nexthop via 172.16.1.7 dev veth1 nexthop via 172.16.1.8 dev veth1" + log_test $? 2 "Delete multipath route with only nh id based entry" } ipv4_grp_fcnal() -- 2.35.1