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

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Message-ID: <f1164c41-c262-0413-dd2f-cded7510b8b6@wanadoo.fr>
Date:   Tue, 28 Dec 2021 09:01:03 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     syzbot+e7d46eb426883fb97efd@...kaller.appspotmail.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: KMSAN: uninit-value in alauda_check_media

Hi,

(3rd try - text only format, other git repo to please syzbot - sorry for 
the noise)

first try (ok, 3rd...) 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-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org/

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: https://github.com/google/kmsan.git master

CJ

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