linux-kernel - Re: KMSAN: uninit-value in alauda_check

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Message-ID: <f78b974a-e36b-6d23-6977-fdf50c05600b@wanadoo.fr>
Date:   Tue, 28 Dec 2021 08:47:15 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     syzbot+e7d46eb426883fb97efd@...kaller.appspotmail.com
Cc:     glider@...gle.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        stern@...land.harvard.edu, syzkaller-bugs@...glegroups.com,
        usb-storage@...ts.one-eyed-alien.net,
        Kernel Janitors <kernel-janitors@...r.kernel.org>
Subject: Re: KMSAN: uninit-value in alauda_check_media

Hi,

(2nd try - text only format - sorry for the noise)

first try to use syzbot. I hope I do it right.
Discussion about the syz report can be found at 
https://lore.kernel.org/linux-kernel/0000000000007d25ff059457342d@google.com/

This patch only test if alauda_get_media_status() (and its embedded 
usb_stor_ctrl_transfer()) before using the data.
In case of error, it returns USB_STOR_TRANSPORT_ERROR as done elsewhere.

#syz test: 
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

CJ

View attachment "patch_alauda.c" of type "text/x-csrc" (983 bytes)