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

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Message-ID: <20191011111732.GA25982@localhost.localdomain>
Date:   Fri, 11 Oct 2019 16:47:32 +0530
From:   Jas K <jaskaransingh7654321@...il.com>
To:     syzbot+e7d46eb426883fb97efd@...kaller.appspotmail.com
Cc:     stern@...land.harvard.edu, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        linux-kernel@...r.kernel.org
Subject: 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

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);