[ALSA] rawmidi: protect against invalid device number in snd_rawmidi_info_select()
Modules: RawMidi Midlevel
In snd_rawmidi_info_select(), check that the device identified by the
passed device number actually exists.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 7a86a9a..d703545 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -573,6 +573,8 @@
if (info->device >= SNDRV_RAWMIDI_DEVICES)
return -ENXIO;
rmidi = snd_rawmidi_devices[card->number * SNDRV_RAWMIDI_DEVICES + info->device];
+ if (!rmidi)
+ return -ENXIO;
if (info->stream < 0 || info->stream > 1)
return -EINVAL;
pstr = &rmidi->streams[info->stream];