linux-kernel - Re: smb cifs: Linux 6.7 pre rc-1 kernel dump in smb2_get_aead

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Message-ID: <2545100.1699264877@warthog.procyon.org.uk>
Date:   Mon, 06 Nov 2023 10:01:17 +0000
From:   David Howells <dhowells@...hat.com>
To:     Damian Tometzki <damian@...cv-rocks.de>
Cc:     dhowells@...hat.com, Eric Biggers <ebiggers@...nel.org>,
        Steve French <smfrench@...il.com>,
        John Sanpe <sanpeqf@...il.com>,
        CIFS <linux-cifs@...r.kernel.org>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Paulo Alcantara <pc@...guebit.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: smb cifs: Linux 6.7 pre rc-1 kernel dump in smb2_get_aead_req

Damian Tometzki <damian@...cv-rocks.de> wrote:

> the revert of f1b4cb650b9a0eeba206d8f069fcdc532bfbcd74 solved the issue of
> the kernel dump.

That almost certainly did not fix the problem - merely hid the wanring.

Prior to f1b4cb650b9a0eeba206d8f069fcdc532bfbcd74, ->user_backed is explicitly
set if the iov_iter is initialised to a user-backed type, now it's just
inferred from the type being 0 or 1 - so I think that the iov_iter has not
been initialised somewhere.

Somewhere being from SMB2_tcon() and cifs_send_recv() on down.

David