linux-kernel - [PATCH] ALSA: wavefront: Fix use-after-free in MIDI operations

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Message-ID:
 <SYBPR01MB78812BAD18C71593392C2C31AFC4A@SYBPR01MB7881.ausprd01.prod.outlook.com>
Date: Tue,  4 Nov 2025 22:11:55 +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 use-after-free in MIDI operations

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

Clear substream pointers in close functions to prevent use-after-free
when timer callbacks or interrupt handlers access them after close.

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_midi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/isa/wavefront/wavefront_midi.c b/sound/isa/wavefront/wavefront_midi.c
index 1250ecba659a..69d87c4cafae 100644
--- a/sound/isa/wavefront/wavefront_midi.c
+++ b/sound/isa/wavefront/wavefront_midi.c
@@ -278,6 +278,7 @@ static int snd_wavefront_midi_input_close(struct snd_rawmidi_substream *substrea
 	        return -EIO;
 
 	guard(spinlock_irqsave)(&midi->open);
+	midi->substream_input[mpu] = NULL;
 	midi->mode[mpu] &= ~MPU401_MODE_INPUT;
 
 	return 0;
@@ -300,6 +301,7 @@ static int snd_wavefront_midi_output_close(struct snd_rawmidi_substream *substre
 	        return -EIO;
 
 	guard(spinlock_irqsave)(&midi->open);
+	midi->substream_output[mpu] = NULL;
 	midi->mode[mpu] &= ~MPU401_MODE_OUTPUT;
 	return 0;
 }
-- 
2.51.1.dirty