From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:47790 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728409AbeLJRNg (ORCPT ); Mon, 10 Dec 2018 12:13:36 -0500 From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com Subject: [PATCH 49/52] fuse: don't crash if version table is NULL Date: Mon, 10 Dec 2018 12:13:15 -0500 Message-Id: <20181210171318.16998-50-vgoyal@redhat.com> In-Reply-To: <20181210171318.16998-1-vgoyal@redhat.com> References: <20181210171318.16998-1-vgoyal@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Miklos Szeredi Version table can be NULL. Do not crash. Signed-off-by: Miklos Szeredi --- fs/fuse/inode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 1ab4df442390..d44827bbfa3d 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -1219,7 +1219,8 @@ int fuse_fill_super_common(struct super_block *sb, fc->version_table_size = mount_data->vertab_len / sizeof(s64); fc->version_table = mount_data->vertab_kaddr; - if (fc->version_table[0] != VERSION_TABLE_MAGIC) { + if (fc->version_table && fc->version_table_size > 0 && + fc->version_table[0] != VERSION_TABLE_MAGIC) { pr_warn("bad version table magic: 0x%16llx\n", fc->version_table[0]); fc->version_table_size = 0; -- 2.13.6