linux-kernel - [PATCH] ALSA: wavefront: Fix integer overflow in sample size validation

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Message-ID:
 <SYBPR01MB7881FA5CEECF0CCEABDD6CC4AFC4A@SYBPR01MB7881.ausprd01.prod.outlook.com>
Date: Tue,  4 Nov 2025 22:10:18 +0800
From: moonafterrain@...look.com
To: Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>
Cc: linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Yuhao Jiang <danisjiang@...il.com>,
	Junrui Luo <moonafterrain@...look.com>
Subject: [PATCH] ALSA: wavefront: Fix integer overflow in sample size validation

From: Junrui Luo <moonafterrain@...look.com>

The wavefront_send_sample() function has an integer overflow issue
when validating sample size. The header->size field is u32 but gets
cast to int for comparison with dev->freemem

Fix by using unsigned comparison to avoid integer overflow.

Reported-by: Yuhao Jiang <danisjiang@...il.com>
Reported-by: Junrui Luo <moonafterrain@...look.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@...r.kernel.org
Signed-off-by: Junrui Luo <moonafterrain@...look.com>
---
 sound/isa/wavefront/wavefront_synth.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index cd5c177943aa..4a8c507eae71 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -950,9 +950,9 @@ wavefront_send_sample (snd_wavefront_t *dev,
 	if (header->size) {
 		dev->freemem = wavefront_freemem (dev);
 
-		if (dev->freemem < (int)header->size) {
+		if ((unsigned int)dev->freemem < header->size) {
 			dev_err(dev->card->dev,
-				"insufficient memory to load %d byte sample.\n",
+				"insufficient memory to load %u byte sample.\n",
 				header->size);
 			return -ENOMEM;
 		}
-- 
2.51.1.dirty