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 B7A7DC433F5 for ; Sun, 9 Oct 2022 22:30:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232196AbiJIWaZ (ORCPT ); Sun, 9 Oct 2022 18:30:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232434AbiJIW3c (ORCPT ); Sun, 9 Oct 2022 18:29:32 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5FAAC3AB3B; Sun, 9 Oct 2022 15:19:16 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1052260C27; Sun, 9 Oct 2022 22:19:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 28991C433D6; Sun, 9 Oct 2022 22:19:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665353955; bh=b1JReA7msw8YFQ4mrmLLiR3n9OjUXXEI8mQ1BJL3EgM=; h=From:To:Cc:Subject:Date:From; b=sac1LphMinSZarnx36G8qI6pV1BbKZCPo464Ql2KO+yotU9Lyf4xwWhCJSZDaUIkB AHyjd4KYZ+IkizagoX00bmU36tIXKnRC6vszBzWu8UWqRtaEIghsLPn/EJCUvGgHVe vy5YhfCpxXe89ap0zV8UyAQf6an+U5YvxOCYWpWqIBRMQ7Mw+JMNYI5+4aRaqEun6C W1RhrDC4hjLVtPHcMZTTr10civv1GtGUsIdJmeAxC74LZefHTbWTMPEA2GRb0AgfaP 2YpRPPtiGL9fMXNxRCoC1SFgwnlWvqEgOSB0IGB8zQ/ipa2UFhBsWoyr/2aw60HDmt 51JXmexBJr9Ow== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zong-Zhe Yang , Ping-Ke Shih , Kalle Valo , Sasha Levin , tony0620emma@gmail.com, 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 01/46] wifi: rtw88: phy: fix warning of possible buffer overflow Date: Sun, 9 Oct 2022 18:18:26 -0400 Message-Id: <20221009221912.1217372-1-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Zong-Zhe Yang [ Upstream commit 86331c7e0cd819bf0c1d0dcf895e0c90b0aa9a6f ] reported by smatch phy.c:854 rtw_phy_linear_2_db() error: buffer overflow 'db_invert_table[i]' 8 <= 8 (assuming for loop doesn't break) However, it seems to be a false alarm because we prevent it originally via if (linear >= db_invert_table[11][7]) return 96; /* maximum 96 dB */ Still, we adjust the code to be more readable and avoid smatch warning. Signed-off-by: Zong-Zhe Yang Signed-off-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220727065003.28340-5-pkshih@realtek.com Signed-off-by: Sasha Levin --- drivers/net/wireless/realtek/rtw88/phy.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c index 569dd3cfde35..df2edb87468f 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -751,23 +751,18 @@ static u8 rtw_phy_linear_2_db(u64 linear) u8 j; u32 dB; - if (linear >= db_invert_table[11][7]) - return 96; /* maximum 96 dB */ - for (i = 0; i < 12; i++) { - if (i <= 2 && (linear << FRAC_BITS) <= db_invert_table[i][7]) - break; - else if (i > 2 && linear <= db_invert_table[i][7]) - break; + for (j = 0; j < 8; j++) { + if (i <= 2 && (linear << FRAC_BITS) <= db_invert_table[i][j]) + goto cnt; + else if (i > 2 && linear <= db_invert_table[i][j]) + goto cnt; + } } - for (j = 0; j < 8; j++) { - if (i <= 2 && (linear << FRAC_BITS) <= db_invert_table[i][j]) - break; - else if (i > 2 && linear <= db_invert_table[i][j]) - break; - } + return 96; /* maximum 96 dB */ +cnt: if (j == 0 && i == 0) goto end; -- 2.35.1