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ALSA: usb-audio: Add sanity checks for invalid EPs

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USB-audio driver may set up a URB containing the fixed EP without
validating its presence for some non-class-compliant devices.  This
may end up with an oops-like kernel warning when submitted.

For avoiding it, this patch adds the call of the new sanity-check
helper for URBs.  The checks are needed only for MIDI I/O as the other
places have already some other checks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2017-10-04 17:22:05 +02:00
parent 2a4340c577
commit 738d9edcfd
1 changed files with 30 additions and 8 deletions
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38
sound/usb/midi.c
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@ -1282,6 +1282,7 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
unsigned int pipe;
int length;
unsigned int i;
int err;
rep->in = NULL;
ep = kzalloc(sizeof(*ep), GFP_KERNEL);
@ -1292,8 +1293,8 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
for (i = 0; i < INPUT_URBS; ++i) {
ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
if (!ep->urbs[i]) {
snd_usbmidi_in_endpoint_delete(ep);
return -ENOMEM;
err = -ENOMEM;
goto error;
}
}
if (ep_info->in_interval)
@ -1305,8 +1306,8 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
&ep->urbs[i]->transfer_dma);
if (!buffer) {
snd_usbmidi_in_endpoint_delete(ep);
return -ENOMEM;
err = -ENOMEM;
goto error;
}
if (ep_info->in_interval)
usb_fill_int_urb(ep->urbs[i], umidi->dev,
@ -1318,10 +1319,20 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
pipe, buffer, length,
snd_usbmidi_in_urb_complete, ep);
ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
err = usb_urb_ep_type_check(ep->urbs[i]);
if (err < 0) {
dev_err(&umidi->dev->dev, "invalid MIDI in EP %x\n",
ep_info->in_ep);
goto error;
}
}
rep->in = ep;
return 0;
error:
snd_usbmidi_in_endpoint_delete(ep);
return -ENOMEM;
}
/*
@ -1357,6 +1368,7 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
unsigned int i;
unsigned int pipe;
void *buffer;
int err;
rep->out = NULL;
ep = kzalloc(sizeof(*ep), GFP_KERNEL);
@ -1367,8 +1379,8 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
for (i = 0; i < OUTPUT_URBS; ++i) {
ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
if (!ep->urbs[i].urb) {
snd_usbmidi_out_endpoint_delete(ep);
return -ENOMEM;
err = -ENOMEM;
goto error;
}
ep->urbs[i].ep = ep;
}
@ -1406,8 +1418,8 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
ep->max_transfer, GFP_KERNEL,
&ep->urbs[i].urb->transfer_dma);
if (!buffer) {
snd_usbmidi_out_endpoint_delete(ep);
return -ENOMEM;
err = -ENOMEM;
goto error;
}
if (ep_info->out_interval)
usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
@ -1419,6 +1431,12 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
pipe, buffer, ep->max_transfer,
snd_usbmidi_out_urb_complete,
&ep->urbs[i]);
err = usb_urb_ep_type_check(ep->urbs[i].urb);
if (err < 0) {
dev_err(&umidi->dev->dev, "invalid MIDI out EP %x\n",
ep_info->out_ep);
goto error;
}
ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
}
@ -1437,6 +1455,10 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
rep->out = ep;
return 0;
error:
snd_usbmidi_out_endpoint_delete(ep);
return err;
}
/*