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;
