From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A37D6C0018C for ; Tue, 7 Nov 2023 12:17:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233975AbjKGMRC (ORCPT ); Tue, 7 Nov 2023 07:17:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234600AbjKGMQL (ORCPT ); Tue, 7 Nov 2023 07:16:11 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECB2846A2; Tue, 7 Nov 2023 04:12:03 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 119F3C433BD; Tue, 7 Nov 2023 12:12:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699359123; bh=1ImHK7UGCVcnn5bdj3JjXWjW9E0s9LVgk+3keyShaZM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H7yS2Csci9EBnMYREQtISVUc+p8+Y928JBsaPfrGKcc4n3Kvlot3OL/TPKhlPNtnT G6YZxseBxSf2TBku293RCjNOaZspdzIkUU2oycLhRkLHE1ZxcryOuuFFenUhP2LX5D vkM30FzTq9vqvQDRF8cctqSKd52Fg9YrqKHrLwmsrpATf9rsKzxfr9k37Fa08i9ijT u6QSt77iVUKq2db/qa7en0sG+3zZvtbYIACocEktLi0qSKfAPBIZKY0kIaybGhFXET YyTmGiL2fk/vKi9GwkQJYWpBeA2MdAShU/wIe0zIcqC4PHPdYaKEmvFFywpee1gwpI vS0+zDI2Ar+ug== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ping-Ke Shih , Zong-Zhe Yang , Johannes Berg , Sasha Levin , johannes@sipsolutions.net, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 02/12] wifi: mac80211: don't return unset power in ieee80211_get_tx_power() Date: Tue, 7 Nov 2023 07:11:39 -0500 Message-ID: <20231107121158.3758348-2-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107121158.3758348-1-sashal@kernel.org> References: <20231107121158.3758348-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.137 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ping-Ke Shih [ Upstream commit e160ab85166e77347d0cbe5149045cb25e83937f ] We can get a UBSAN warning if ieee80211_get_tx_power() returns the INT_MIN value mac80211 internally uses for "unset power level". UBSAN: signed-integer-overflow in net/wireless/nl80211.c:3816:5 -2147483648 * 100 cannot be represented in type 'int' CPU: 0 PID: 20433 Comm: insmod Tainted: G WC OE Call Trace: dump_stack+0x74/0x92 ubsan_epilogue+0x9/0x50 handle_overflow+0x8d/0xd0 __ubsan_handle_mul_overflow+0xe/0x10 nl80211_send_iface+0x688/0x6b0 [cfg80211] [...] cfg80211_register_wdev+0x78/0xb0 [cfg80211] cfg80211_netdev_notifier_call+0x200/0x620 [cfg80211] [...] ieee80211_if_add+0x60e/0x8f0 [mac80211] ieee80211_register_hw+0xda5/0x1170 [mac80211] In this case, simply return an error instead, to indicate that no data is available. Cc: Zong-Zhe Yang Signed-off-by: Ping-Ke Shih Link: https://lore.kernel.org/r/20230203023636.4418-1-pkshih@realtek.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/cfg.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 4fa216a108ae8..02bd90a537058 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2762,6 +2762,10 @@ static int ieee80211_get_tx_power(struct wiphy *wiphy, else *dbm = sdata->vif.bss_conf.txpower; + /* INT_MIN indicates no power level was set yet */ + if (*dbm == INT_MIN) + return -EINVAL; + return 0; } -- 2.42.0