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ALSA: usb-audio: Cap the packet size pre-calculations

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We calculate the possible packet sizes beforehand for adaptive and
synchronous endpoints, but we didn't take care of the max frame size
for those pre-calculated values.  When a device or a bus limits the
packet size, a high sample rate or a high number of channels may lead
to the packet sizes that are larger than the given limit, which
results in an error from the USB core at submitting URBs.

As a simple workaround, just add the sanity checks of pre-calculated
packet sizes to have the upper boundary of ep->maxframesize.

Fixes: f0bd62b640 ("ALSA: usb-audio: Improve frames size computation")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=221076
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260225085233.316306-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2026-02-25 09:52:28 +01:00
parent 0d58273be0
commit 7fe8dec3f6
1 changed files with 3 additions and 0 deletions
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3
sound/usb/endpoint.c
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@ -1378,6 +1378,9 @@ int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
return -EINVAL;
}
ep->packsize[0] = min(ep->packsize[0], ep->maxframesize);
ep->packsize[1] = min(ep->packsize[1], ep->maxframesize);
/* calculate the frequency in 16.16 format */
ep->freqm = ep->freqn;
ep->freqshift = INT_MIN;