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 391DC2F8DE0; Mon, 5 May 2025 22:25:27 +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=1746483928; cv=none; b=iuzA1f3685Qi827+0JO0GcfGszIPTTkgF3rxRXCyYn1u83kz0buzZIz0blKuDezs/7DOhtHuOtC6jRkSn3TkP2GIBAiQ49h+OVuh2zsINP5tkpmbGuVJtocyDqeF83Pf6H/R95+6kIHzaWaUVWBP6YBmsg0w0Iss96O8shPqHK0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746483928; c=relaxed/simple; bh=R59kCnJjiCPA0MC84qR3zibb+XfB2hs5mE1ghbwXHkc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HHJBaMa1UTf7DXzQ/mnazMpEk+D4HboJwb4z3ursHehALZdeht/oxeSb+bVW/I/yvYani9NplmklTH0SGpmFPYPgUWfEruLlmM2Lsa6x3iF3xz59Bhe5VGiUJpDtQBUMeL4a8H4jdFgflmyLXczsFNCEwPI3aHLwqohSmMQn3IQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bm85iy1I; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bm85iy1I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 741B5C4CEED; Mon, 5 May 2025 22:25:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746483927; bh=R59kCnJjiCPA0MC84qR3zibb+XfB2hs5mE1ghbwXHkc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bm85iy1IKKDBpS9AfmPLKbzFyZYa7ZZ9MWqSzw7HnNbGnXuo69v7dH0AtyR/ZKNAO SXmI8zO5xnctfsL4P2GCSSB+fjYhXXJu9cmXY5U5fKvAeDs4sUC8P66boxjwBXcCCa VOnG4hkqGEG3eSfqYAU6Z4RTlkHSRBw3kUxL0wlxIcxO4z20Y/QQuaEN2uu5R8EHOj 0dsAbeberhKuBBiB5XKYcz3Gk0viN2n5keIGS4IlzRbBBKSnEJK7+cNJxzwCUI1NWV uyZW2ICi824koK5EolKCvwTrdl+IOrlaJ2ViGNqieRZLHWMyRicUVFr390cbE6c1GV +zcTiMFRXXP+A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kuniyuki Iwashima , Eric Dumazet , David Ahern , Jakub Kicinski , Sasha Levin , davem@davemloft.net, pabeni@redhat.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.14 273/642] ipv4: fib: Move fib_valid_key_len() to rtm_to_fib_config(). Date: Mon, 5 May 2025 18:08:09 -0400 Message-Id: <20250505221419.2672473-273-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505221419.2672473-1-sashal@kernel.org> References: <20250505221419.2672473-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.14.5 Content-Transfer-Encoding: 8bit From: Kuniyuki Iwashima [ Upstream commit 254ba7e6032d3fc738050d500b0c1d8197af90ca ] fib_valid_key_len() is called in the beginning of fib_table_insert() or fib_table_delete() to check if the prefix length is valid. fib_table_insert() and fib_table_delete() are called from 3 paths - ip_rt_ioctl() - inet_rtm_newroute() / inet_rtm_delroute() - fib_magic() In the first ioctl() path, rtentry_to_fib_config() checks the prefix length with bad_mask(). Also, fib_magic() always passes the correct prefix: 32 or ifa->ifa_prefixlen, which is already validated. Let's move fib_valid_key_len() to the rtnetlink path, rtm_to_fib_config(). While at it, 2 direct returns in rtm_to_fib_config() are changed to goto to match other places in the same function Signed-off-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Reviewed-by: David Ahern Link: https://patch.msgid.link/20250228042328.96624-12-kuniyu@amazon.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv4/fib_frontend.c | 18 ++++++++++++++++-- net/ipv4/fib_trie.c | 22 ---------------------- 2 files changed, 16 insertions(+), 24 deletions(-) diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 272e42d813230..493c37ce232d3 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -837,19 +837,33 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, } } + if (cfg->fc_dst_len > 32) { + NL_SET_ERR_MSG(extack, "Invalid prefix length"); + err = -EINVAL; + goto errout; + } + + if (cfg->fc_dst_len < 32 && (ntohl(cfg->fc_dst) << cfg->fc_dst_len)) { + NL_SET_ERR_MSG(extack, "Invalid prefix for given prefix length"); + err = -EINVAL; + goto errout; + } + if (cfg->fc_nh_id) { if (cfg->fc_oif || cfg->fc_gw_family || cfg->fc_encap || cfg->fc_mp) { NL_SET_ERR_MSG(extack, "Nexthop specification and nexthop id are mutually exclusive"); - return -EINVAL; + err = -EINVAL; + goto errout; } } if (has_gw && has_via) { NL_SET_ERR_MSG(extack, "Nexthop configuration can not contain both GATEWAY and VIA"); - return -EINVAL; + err = -EINVAL; + goto errout; } if (!cfg->fc_table) diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index d6411ac810961..59a6f0a9638f9 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -1187,22 +1187,6 @@ static int fib_insert_alias(struct trie *t, struct key_vector *tp, return 0; } -static bool fib_valid_key_len(u32 key, u8 plen, struct netlink_ext_ack *extack) -{ - if (plen > KEYLENGTH) { - NL_SET_ERR_MSG(extack, "Invalid prefix length"); - return false; - } - - if ((plen < KEYLENGTH) && (key << plen)) { - NL_SET_ERR_MSG(extack, - "Invalid prefix for given prefix length"); - return false; - } - - return true; -} - static void fib_remove_alias(struct trie *t, struct key_vector *tp, struct key_vector *l, struct fib_alias *old); @@ -1223,9 +1207,6 @@ int fib_table_insert(struct net *net, struct fib_table *tb, key = ntohl(cfg->fc_dst); - if (!fib_valid_key_len(key, plen, extack)) - return -EINVAL; - pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen); fi = fib_create_info(cfg, extack); @@ -1717,9 +1698,6 @@ int fib_table_delete(struct net *net, struct fib_table *tb, key = ntohl(cfg->fc_dst); - if (!fib_valid_key_len(key, plen, extack)) - return -EINVAL; - l = fib_find_node(t, &tp, key); if (!l) return -ESRCH; -- 2.39.5