From nobody Thu Apr 9 04:43:54 2026 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 8FF16C43217 for ; Wed, 2 Nov 2022 08:55:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230452AbiKBIzr (ORCPT ); Wed, 2 Nov 2022 04:55:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230464AbiKBIzj (ORCPT ); Wed, 2 Nov 2022 04:55:39 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CBEA27DFC for ; Wed, 2 Nov 2022 01:55:35 -0700 (PDT) Received: from dggpemm500024.china.huawei.com (unknown [172.30.72.53]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4N2LM64N6fz15MCj; Wed, 2 Nov 2022 16:55:30 +0800 (CST) Received: from dggpemm100009.china.huawei.com (7.185.36.113) by dggpemm500024.china.huawei.com (7.185.36.203) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 2 Nov 2022 16:55:33 +0800 Received: from huawei.com (10.175.113.32) by dggpemm100009.china.huawei.com (7.185.36.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Wed, 2 Nov 2022 16:55:33 +0800 From: Liu Shixin To: Dave Kleikamp CC: , , Liu Shixin Subject: [PATCH] fs/jfs: fix assert failed in dbFindBits() Date: Wed, 2 Nov 2022 17:43:48 +0800 Message-ID: <20221102094348.2048443-1-liushixin2@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.113.32] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm100009.china.huawei.com (7.185.36.113) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" syzkaller reported a bug: BUG at fs/jfs/jfs_dmap.c:2984 assert(bitno < 32) Since we increased bitno before check (mask !=3D 0) in the loop, the value can reach 32. Modify the assert condition to (bitno <=3D 32) to fix it. Reported-by: syzbot+c6357942fbe0fce51c76@syzkaller.appspotmail.com Signed-off-by: Liu Shixin --- fs/jfs/jfs_dmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 6b838d3ae7c2..7bd57728edf3 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -2981,7 +2981,7 @@ static int dbFindBits(u32 word, int l2nb) break; } =20 - ASSERT(bitno < 32); + ASSERT(bitno <=3D 32); =20 /* return the bit number. */ --=20 2.25.1