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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 EE45CC4332E for ; Wed, 24 Feb 2021 14:00:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B71CF64EC4 for ; Wed, 24 Feb 2021 14:00:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238191AbhBXN7M (ORCPT ); Wed, 24 Feb 2021 08:59:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:58430 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235806AbhBXNHN (ORCPT ); Wed, 24 Feb 2021 08:07:13 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id C63C564F8A; Wed, 24 Feb 2021 12:54:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614171265; bh=ZDSGtqQMqznruC3i1uHg8aXjYRDodJFZt8lPSkU8j7E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nkgAEiNwQ9F2FAriAhKX0p1/O5aCmio35m9N3dDMCL4ZF3f5y3z/a//9uw/wbsI28 IMsSCrbjKo2xa/C2C/9QIQ0VzmJwcHdmAitl79Hrb8Yt+vUaLu2d8+ADYIOgsLmrWL FVYHUmIqG3TqjH/gU8eZU1j+b8RnGLGQltJMhLno5CNcEZBE3oXIpL9wHQnKSo3BFq R+qn4gTVSi7QmHqTeQYuYg0DRfMdwuYXvEJZbSsuBaaH5iWHtYP3JQHVjm9iB6N5hn PhD6MMpm6bnEK6ae4fafNL+CeRmMdzbytFAA1mSWOsKZz9TcuWvAyuG9Vwj+4EQnla hWGZGUEtljrrw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Gao Xiang , syzbot+c68f467cd7c45860e8d4@syzkaller.appspotmail.com, Chao Yu , Sasha Levin , linux-erofs@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.4 34/40] erofs: fix shift-out-of-bounds of blkszbits Date: Wed, 24 Feb 2021 07:53:34 -0500 Message-Id: <20210224125340.483162-34-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210224125340.483162-1-sashal@kernel.org> References: <20210224125340.483162-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gao Xiang [ Upstream commit bde545295b710bdd13a0fcd4b9fddd2383eeeb3a ] syzbot generated a crafted bitszbits which can be shifted out-of-bounds[1]. So directly print unsupported blkszbits instead of blksize. [1] https://lore.kernel.org/r/000000000000c72ddd05b9444d2f@google.com Link: https://lore.kernel.org/r/20210120013016.14071-1-hsiangkao@aol.com Reported-by: syzbot+c68f467cd7c45860e8d4@syzkaller.appspotmail.com Reviewed-by: Chao Yu Signed-off-by: Gao Xiang Signed-off-by: Sasha Levin --- fs/erofs/super.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 0e369494f2f2c..22e059b4f745c 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -124,8 +124,8 @@ static int erofs_read_superblock(struct super_block *sb) blkszbits = dsb->blkszbits; /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */ if (blkszbits != LOG_BLOCK_SIZE) { - erofs_err(sb, "blksize %u isn't supported on this platform", - 1 << blkszbits); + erofs_err(sb, "blkszbits %u isn't supported on this platform", + blkszbits); goto out; } -- 2.27.0