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 X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA055C433F5 for ; Mon, 13 Sep 2021 14:34:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D217860E08 for ; Mon, 13 Sep 2021 14:34:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347505AbhIMOek (ORCPT ); Mon, 13 Sep 2021 10:34:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:51904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346887AbhIMO3y (ORCPT ); Mon, 13 Sep 2021 10:29:54 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5C032615A7; Mon, 13 Sep 2021 13:50:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631541048; bh=qQ8jGAPDTJUFuzuBdGRvDqaxOg8Q2tXTxaqa0Oocntc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dpICZtoBRwxJKY5lv7KSSd/RjTyfHoZWO5M7FW2bzNgqpNC9DE5HcSXDMw3IcLbbA lOIxjGSyarNskWHWT+0kpiJbN3B8SDSK5bBHLrqeZg73qn84gSBmSRshoBIolcMqj5 TtCII80DdhRkMDG3yIgSlOYK84fEYE4WzD9Us36o= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kernel test robot , Andy Shevchenko , Richard Fitzgerald , Petr Mladek , Sasha Levin Subject: [PATCH 5.14 142/334] lib/test_scanf: Handle n_bits == 0 in random tests Date: Mon, 13 Sep 2021 15:13:16 +0200 Message-Id: <20210913131118.151910188@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131113.390368911@linuxfoundation.org> References: <20210913131113.390368911@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andy Shevchenko [ Upstream commit fe8e3ee0d588566c1f44f28a555042ef50eba491 ] UBSAN reported (via LKP) [ 11.021349][ T1] UBSAN: shift-out-of-bounds in lib/test_scanf.c:275:51 [ 11.022782][ T1] shift exponent 32 is too large for 32-bit type 'unsigned int' When n_bits == 0, the shift is out of range. Switch code to use GENMASK to handle this case. Fixes: 50f530e176ea ("lib: test_scanf: Add tests for sscanf number conversion") Reported-by: kernel test robot Signed-off-by: Andy Shevchenko Reviewed-by: Richard Fitzgerald Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20210727150132.28920-1-andriy.shevchenko@linux.intel.com Signed-off-by: Sasha Levin --- lib/test_scanf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/test_scanf.c b/lib/test_scanf.c index 84fe09eaf55e..abae88848972 100644 --- a/lib/test_scanf.c +++ b/lib/test_scanf.c @@ -271,7 +271,7 @@ static u32 __init next_test_random(u32 max_bits) { u32 n_bits = hweight32(prandom_u32_state(&rnd_state)) % (max_bits + 1); - return prandom_u32_state(&rnd_state) & (UINT_MAX >> (32 - n_bits)); + return prandom_u32_state(&rnd_state) & GENMASK(n_bits, 0); } static unsigned long long __init next_test_random_ull(void) @@ -280,7 +280,7 @@ static unsigned long long __init next_test_random_ull(void) u32 n_bits = (hweight32(rand1) * 3) % 64; u64 val = (u64)prandom_u32_state(&rnd_state) * rand1; - return val & (ULLONG_MAX >> (64 - n_bits)); + return val & GENMASK_ULL(n_bits, 0); } #define random_for_type(T) \ -- 2.30.2