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@gmail.com Reported-by: Junrui Luo moonafterrain@outlook.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Junrui Luo moonafterrain@outlook.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; }