ALSA: seq: oss: Fix races at processing SysEx messages

commit 0179488ca992d79908b8e26b9213f1554fc5bacc upstream.

OSS sequencer handles the SysEx messages split in 6 bytes packets, and
ALSA sequencer OSS layer tries to combine those.  It stores the data
in the internal buffer and this access is racy as of now, which may
lead to the out-of-bounds access.

As a temporary band-aid fix, introduce a mutex for serializing the
process of the SysEx message packets.

Reported-by: Kun Hu <[email protected]>
Closes: https://lore.kernel.org/[email protected]
Cc: <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: tiwai

sound/core/seq/oss/seq_oss_synth.c

@@ -66,6 +66,7 @@ static struct seq_oss_synth midi_synth_dev = {
 };
 
 static DEFINE_SPINLOCK(register_lock);
+static DEFINE_MUTEX(sysex_mutex);
 
 /*
  * prototypes
@@ -497,6 +498,7 @@ snd_seq_oss_synth_sysex(struct seq_oss_devinfo *dp, int dev, unsigned char *buf,
 	if (!info)
 		return -ENXIO;
 
+	guard(mutex)(&sysex_mutex);
 	sysex = info->sysex;
 	if (sysex == NULL) {
 		sysex = kzalloc(sizeof(*sysex), GFP_KERNEL);