From: Takashi Iwai Date: Wed, 26 Nov 2025 10:08:31 +0000 (+0100) Subject: ALSA: usb-audio: Fix missing unlock at error path of maxpacksize check X-Git-Tag: v6.12.60~21 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fdf0dc82eb60091772ecea73cbc5a8fb7562fc45;p=thirdparty%2Fkernel%2Fstable.git ALSA: usb-audio: Fix missing unlock at error path of maxpacksize check The recent backport of the upstream commit 05a1fc5efdd8 ("ALSA: usb-audio: Fix potential overflow of PCM transfer buffer") on the older stable kernels like 6.12.y was broken since it doesn't consider the mutex unlock, where the upstream code manages with guard(). In the older code, we still need an explicit unlock. This is a fix that corrects the error path, applied only on old stable trees. Reported-by: Pavel Machek Closes: https://lore.kernel.org/aSWtH0AZH5+aeb+a@duo.ucw.cz Fixes: 98e9d5e33bda ("ALSA: usb-audio: Fix potential overflow of PCM transfer buffer") Reviewed-by: Pavel Machek Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 7238f65cbcfff..aa201e4744bf6 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -1389,7 +1389,8 @@ int snd_usb_endpoint_set_params(struct snd_usb_audio *chip, if (ep->packsize[1] > ep->maxpacksize) { usb_audio_dbg(chip, "Too small maxpacksize %u for rate %u / pps %u\n", ep->maxpacksize, ep->cur_rate, ep->pps); - return -EINVAL; + err = -EINVAL; + goto unlock; } /* calculate the frequency in 16.16 format */