The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 362372ceb6556f338e230f2d90af27b47f82365a Mon Sep 17 00:00:00 2001

From: Takashi Iwai tiwai@suse.de Date: Tue, 22 Jun 2021 11:06:47 +0200 Subject: [PATCH] ALSA: usb-audio: Fix OOB access at proc output

At extending the available mixer values for 32bit types, we forgot to add the corresponding entries for the format dump in the proc output. This may result in OOB access. Here adds the missing entries.

Fixes: bc18e31c3042 ("ALSA: usb-audio: Fix parameter block size for UAC2 control requests") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210622090647.14021-1-tiwai@suse.de Signed-off-by: Takashi Iwai tiwai@suse.de

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 428d581f988f..4ea4875abdf8 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -3294,8 +3294,9 @@ static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer, struct usb_mixer_elem_list *list) { struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list); - static const char * const val_types[] = {"BOOLEAN", "INV_BOOLEAN", - "S8", "U8", "S16", "U16"}; + static const char * const val_types[] = { + "BOOLEAN", "INV_BOOLEAN", "S8", "U8", "S16", "U16", "S32", "U32", + }; snd_iprintf(buffer, " Info: id=%i, control=%i, cmask=0x%x, " "channels=%i, type="%s"\n", cval->head.id, cval->control, cval->cmask, cval->channels,