linux-kernel - [PATCH] ALSA: usb-audio: Fix size validation in convert_chmap

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Message-ID: <aKL5kftC1qGt6lpv@stanley.mountain>
Date: Mon, 18 Aug 2025 12:59:45 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Takashi Iwai <tiwai@...e.de>
Cc: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Karol Kosik <k.kosik@...look.com>,
	Youngjun Lee <yjjuny.lee@...sung.com>, linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] ALSA: usb-audio: Fix size validation in convert_chmap_v3()

The "p" pointer is void so sizeof(*p) is 1.  The intent was to check
sizeof(*cs_desc), which is 3, instead.

Fixes: ecfd41166b72 ("ALSA: usb-audio: Validate UAC3 cluster segment descriptors")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 sound/usb/stream.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index acf3dc2d79e0..5c235a5ba7e1 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -349,7 +349,7 @@ snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
 		u16 cs_len;
 		u8 cs_type;
 
-		if (len < sizeof(*p))
+		if (len < sizeof(*cs_desc))
 			break;
 		cs_len = le16_to_cpu(cs_desc->wLength);
 		if (len < cs_len)
-- 
2.47.2