[PATCH] ALSA: wavefront: Clear substream pointers on close
From: Junrui Luo
Date: Wed Nov 05 2025 - 21:26:37 EST
Clear substream pointers in close functions to avoid leaving dangling
pointers, helping to improve code safety and
prevents potential issues.
Reported-by: Yuhao Jiang <danisjiang@xxxxxxxxx>
Reported-by: Junrui Luo <moonafterrain@xxxxxxxxxxx>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Junrui Luo <moonafterrain@xxxxxxxxxxx>
---
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