From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4D40F848C for ; Fri, 10 Mar 2023 14:23:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C891DC433D2; Fri, 10 Mar 2023 14:23:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678458200; bh=59+TRHuxBRWQzU+nD978+9ncOo9GSu4QEh44xEI+L/8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0hLzZJy+TjjvS+C/kXCe+EhiJUlbEYW8wi4aNlbsj/MRhOiJdHCAdZgIqy+ovIG8Y omlqBEYr6TpFLaa+KXmFcDqbYV9bPe0FiIlYM4leG+/cmP5R+gQIgPfzvCV0+IYPdl OIJq9Wt9kqco5i5FurCQnlJXqiSw16J7x2xQm+AU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+0be96567042453c0c820@syzkaller.appspotmail.com, Liu Shixin , Dave Kleikamp , Sasha Levin Subject: [PATCH 4.19 198/252] fs/jfs: fix shift exponent db_agl2size negative Date: Fri, 10 Mar 2023 14:39:28 +0100 Message-Id: <20230310133724.998797315@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.803482157@linuxfoundation.org> References: <20230310133718.803482157@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Liu Shixin via Jfs-discussion [ Upstream commit fad376fce0af58deebc5075b8539dc05bf639af3 ] As a shift exponent, db_agl2size can not be less than 0. Add the missing check to fix the shift-out-of-bounds bug reported by syzkaller: UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:2227:15 shift exponent -744642816 is negative Reported-by: syzbot+0be96567042453c0c820@syzkaller.appspotmail.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Liu Shixin Signed-off-by: Dave Kleikamp Signed-off-by: Sasha Levin --- fs/jfs/jfs_dmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index f06796cad9aa8..3ad0a33e0443b 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -206,7 +206,8 @@ int dbMount(struct inode *ipbmap) bmp->db_agwidth = le32_to_cpu(dbmp_le->dn_agwidth); bmp->db_agstart = le32_to_cpu(dbmp_le->dn_agstart); bmp->db_agl2size = le32_to_cpu(dbmp_le->dn_agl2size); - if (bmp->db_agl2size > L2MAXL2SIZE - L2MAXAG) { + if (bmp->db_agl2size > L2MAXL2SIZE - L2MAXAG || + bmp->db_agl2size < 0) { err = -EINVAL; goto err_release_metapage; } -- 2.39.2