From: Junrui Luo Date: Tue, 16 Dec 2025 12:03:55 +0000 (-0500) Subject: ALSA: wavefront: Clear substream pointers on close X-Git-Tag: v5.15.198~117 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=151c632b9162f600b0d6a79f4cdcbc388b69ee48;p=thirdparty%2Fkernel%2Fstable.git ALSA: wavefront: Clear substream pointers on close [ Upstream commit e11c5c13ce0ab2325d38fe63500be1dd88b81e38 ] Clear substream pointers in close functions to avoid leaving dangling pointers, helping to improve code safety and prevents potential issues. Reported-by: Yuhao Jiang Reported-by: Junrui Luo Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Junrui Luo Link: https://patch.msgid.link/SYBPR01MB7881DF762CAB45EE42F6D812AFC2A@SYBPR01MB7881.ausprd01.prod.outlook.com Signed-off-by: Takashi Iwai [ No guard() in older trees ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/sound/isa/wavefront/wavefront_midi.c b/sound/isa/wavefront/wavefront_midi.c index 72e775ac7ad7f..a53c1d599f13f 100644 --- a/sound/isa/wavefront/wavefront_midi.c +++ b/sound/isa/wavefront/wavefront_midi.c @@ -294,6 +294,7 @@ static int snd_wavefront_midi_input_close(struct snd_rawmidi_substream *substrea return -EIO; spin_lock_irqsave (&midi->open, flags); + midi->substream_input[mpu] = NULL; midi->mode[mpu] &= ~MPU401_MODE_INPUT; spin_unlock_irqrestore (&midi->open, flags); @@ -318,6 +319,7 @@ static int snd_wavefront_midi_output_close(struct snd_rawmidi_substream *substre return -EIO; spin_lock_irqsave (&midi->open, flags); + midi->substream_output[mpu] = NULL; midi->mode[mpu] &= ~MPU401_MODE_OUTPUT; spin_unlock_irqrestore (&midi->open, flags); return 0;