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ALSA: line6: fix stack overflow in line6_midi_transmit

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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>
This commit is contained in:
Artem Egorkine 2022-12-25 12:57:28 +02:00 committed by Greg Kroah-Hartman
parent 10a07d81f6
commit 25e8c6ecb4
1 changed files with 2 additions and 1 deletions
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3
sound/usb/line6/midi.c
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@ -44,7 +44,8 @@ static void line6_midi_transmit(struct snd_rawmidi_substream *substream)
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)