From: Artem Egorkine arteme@gmail.com
commit b8800d324abb50160560c636bfafe2c81001b66c upstream.
Correctly calculate available space including the size of the chunk buffer. This fixes a buffer overflow when multiple MIDI sysex messages are sent to a PODxt device.
Signed-off-by: Artem Egorkine arteme@gmail.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20221225105728.1153989-2-arteme@gmail.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/usb/line6/midi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/sound/usb/line6/midi.c +++ b/sound/usb/line6/midi.c @@ -48,7 +48,8 @@ static void line6_midi_transmit(struct s int req, done;
for (;;) { - req = min(line6_midibuf_bytes_free(mb), line6->max_packet_size); + req = min3(line6_midibuf_bytes_free(mb), line6->max_packet_size, + LINE6_FALLBACK_MAXPACKETSIZE); done = snd_rawmidi_transmit_peek(substream, chunk, req);
if (done == 0)