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Date:   Fri, 03 Nov 2017 20:52:49 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     "Andrey Konovalov" <andreyknvl@...gle.com>
Cc:     <alsa-devel@...a-project.org>, "Arnd Bergmann" <arnd@...db.de>,
        "Arvind Yadav" <arvind.yadav.cs@...il.com>,
        "Dave Jiang" <dave.jiang@...el.com>,
        "Johan Hovold" <johan@...nel.org>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Jaroslav Kysela" <perex@...ex.cz>,
        "Markus Elfring" <elfring@...rs.sourceforge.net>,
        "LKML" <linux-kernel@...r.kernel.org>,
        "Dmitry Vyukov" <dvyukov@...gle.com>,
        "Kostya Serebryany" <kcc@...gle.com>,
        "syzkaller" <syzkaller@...glegroups.com>
Subject: Re: usb/sound/usx2y: WARNING in usb_stream_start

On Fri, 03 Nov 2017 15:44:59 +0100,
Andrey Konovalov wrote:
> 
> Hi!
> 
> I've got the following report while fuzzing the kernel with syzkaller.
> 
> On commit 3a99df9a3d14cd866b5516f8cba515a3bfd554ab (4.14-rc7+).
> 
> Looks like there's no check for the actual endpoint types.
> 
> usb 1-1: BOGUS urb xfer, pipe 0 != type 3
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 24 at drivers/usb/core/urb.c:471
> usb_submit_urb+0x113e/0x1400
> Modules linked in:
> CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted
> 4.14.0-rc7-44290-gf28444df2601-dirty #52
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> Workqueue: usb_hub_wq hub_event
> task: ffff88006bef5c00 task.stack: ffff88006bf60000
> RIP: 0010:usb_submit_urb+0x113e/0x1400 drivers/usb/core/urb.c:470
> RSP: 0018:ffff88006bf67440 EFLAGS: 00010286
> RAX: 0000000000000029 RBX: ffff880064698c80 RCX: ffffffff812495b5
> RDX: 0000000000000000 RSI: ffffffff8124d76a RDI: 0000000000000005
> RBP: ffff88006bf674b0 R08: ffff88006bef5c00 R09: 0000000000000006
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000003 R14: ffff880069a25a20 R15: ffff880064698d04
> FS:  0000000000000000(0000) GS:ffff88006ca00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fe6fdba3000 CR3: 0000000068470000 CR4: 00000000000006f0
> Call Trace:
>  usb_stream_start+0x48a/0x9f0 sound/usb/usx2y/usb_stream.c:690
>  us122l_start+0x116/0x290 sound/usb/usx2y/us122l.c:365
(snip)

OK, so this looks like another typical issue.
A totally untested patch is below.  Could you check whether it covers?


thanks,

Takashi

---
diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
index e229abd21652..5c4311b6afd6 100644
--- a/sound/usb/usx2y/usb_stream.c
+++ b/sound/usb/usx2y/usb_stream.c
@@ -56,7 +56,7 @@ static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb)
 		    lb, s->period_size);
 }
 
-static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
+static int init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
 			   struct urb **urbs, char *transfer,
 			   struct usb_device *dev, int pipe)
 {
@@ -77,6 +77,8 @@ static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
 		urb->interval = 1;
 		if (usb_pipeout(pipe))
 			continue;
+		if (usb_urb_ep_type_check(urb))
+			return -EINVAL;
 
 		urb->transfer_buffer_length = transfer_length;
 		desc = urb->iso_frame_desc;
@@ -87,9 +89,11 @@ static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
 			desc[p].length = maxpacket;
 		}
 	}
+
+	return 0;
 }
 
-static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
+static int init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
 		      struct usb_device *dev, int in_pipe, int out_pipe)
 {
 	struct usb_stream	*s = sk->s;
@@ -103,9 +107,13 @@ static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
 		sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
 	}
 
-	init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
-	init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
-		       out_pipe);
+	if (init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe))
+		return -EINVAL;
+	if (init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
+			   out_pipe))
+		return -EINVAL;
+
+	return 0;
 }
 
 
@@ -226,7 +234,11 @@ struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
 	else
 		sk->freqn = get_usb_high_speed_rate(sample_rate);
 
-	init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
+	if (init_urbs(sk, use_packsize, dev, in_pipe, out_pipe) < 0) {
+		usb_stream_free(sk);
+		return NULL;
+	}
+
 	sk->s->state = usb_stream_stopped;
 out:
 	return sk->s;

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