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authorTakashi Iwai <tiwai@suse.de>2017-10-04 15:07:21 +0200
committerTakashi Iwai <tiwai@suse.de>2017-10-11 15:14:50 +0200
commit58fc7f73a85d45a47057dad2af53502fdf6cf778 (patch)
tree2938101dfe440c3bef46b8ee788379a767681eee /sound/usb
parent6815a0b444572527256f0d0efd8efe3ddede6018 (diff)
ALSA: caiaq: Add a sanity check for invalid EPs
As syzkaller spotted, currently caiaq driver submits a URB with the fixed EP without checking whether it's actually available, which may result in a kernel warning like: usb 1-1: BOGUS urb xfer, pipe 3 != type 1 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1150 at drivers/usb/core/urb.c:449 usb_submit_urb+0xf8a/0x11d0 Modules linked in: CPU: 1 PID: 1150 Comm: kworker/1:1 Not tainted 4.14.0-rc2-42660-g24b7bd59eec0 #277 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: init_card sound/usb/caiaq/device.c:467 snd_probe+0x81c/0x1150 sound/usb/caiaq/device.c:525 usb_probe_interface+0x35d/0x8e0 drivers/usb/core/driver.c:361 .... This patch adds a sanity check of validity of EPs at the device initialization phase for avoiding the call with an invalid EP. Reported-by: Andrey Konovalov <andreyknvl@google.com> Tested-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/caiaq/device.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/sound/usb/caiaq/device.c b/sound/usb/caiaq/device.c
index 0fb6b1b79261..a29674bf96e5 100644
--- a/sound/usb/caiaq/device.c
+++ b/sound/usb/caiaq/device.c
@@ -461,6 +461,13 @@ static int init_card(struct snd_usb_caiaqdev *cdev)
cdev->midi_out_buf, EP1_BUFSIZE,
snd_usb_caiaq_midi_output_done, cdev);
+ /* sanity checks of EPs before actually submitting */
+ if (usb_urb_ep_type_check(&cdev->ep1_in_urb) ||
+ usb_urb_ep_type_check(&cdev->midi_out_urb)) {
+ dev_err(dev, "invalid EPs\n");
+ return -EINVAL;
+ }
+
init_waitqueue_head(&cdev->ep1_wait_queue);
init_waitqueue_head(&cdev->prepare_wait_queue);