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

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Date:   Fri, 11 Oct 2019 04:17:37 -0700
From:   syzbot <syzbot+e7d46eb426883fb97efd@...kaller.appspotmail.com>
To:     Jas K <jaskaransingh7654321@...il.com>
Cc:     gregkh@...uxfoundation.org, jaskaransingh7654321@...il.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        stern@...land.harvard.edu, usb-storage@...ts.one-eyed-alien.net,
        syzkaller-bugs@...glegroups.com
Subject: Re: Re: KMSAN: uninit-value in alauda_check_media

> Hi, just taking a crack at this. Hope you guys don't mind.

> #syz test: https://github.com/google/kasan.git 1e76a3e5

KMSAN bugs can only be tested on https://github.com/google/kmsan.git tree
because KMSAN tool is not upstreamed yet.
See https://goo.gl/tpsmEJ#kmsan-bugs for details.


> diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
> index ddab2cd3d2e7..bb309b9ad65b 100644
> --- a/drivers/usb/storage/alauda.c
> +++ b/drivers/usb/storage/alauda.c
> @@ -452,7 +452,7 @@ static int alauda_init_media(struct us_data *us)
>   static int alauda_check_media(struct us_data *us)
>   {
>   	struct alauda_info *info = (struct alauda_info *) us->extra;
> -	unsigned char status[2];
> +	unsigned char *status = us->iobuf;
>   	int rc;

>   	rc = alauda_get_media_status(us, status);