ALSA: line6: Fix endless MIDI read loop
authorTakashi Iwai <tiwai@suse.de>
Mon, 9 Mar 2020 09:59:22 +0000 (10:59 +0100)
committerTakashi Iwai <tiwai@suse.de>
Mon, 9 Mar 2020 10:00:45 +0000 (11:00 +0100)
commitd683469b3c93d7e2afd39e6e1970f24700eb7a68
treeb103ebcbd4c8d22ffd5c6642b80b47fb0011aa88
parentf2ecf903ef06eb1bbbfa969db9889643d487e73a
ALSA: line6: Fix endless MIDI read loop

The MIDI input event parser of the LINE6 driver may enter into an
endless loop when the unexpected data sequence is given, as it tries
to continue the secondary bytes without termination.  Also, when the
input data is too short, the parser returns a negative error, while
the caller doesn't handle it properly.  This would lead to the
unexpected behavior as well.

This patch addresses those issues by checking the return value
correctly and handling the one-byte event in the parser properly.

The bug was reported by syzkaller.

Reported-by: syzbot+cce32521ee0a824c21f7@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000033087059f8f8fa3@google.com
Link: https://lore.kernel.org/r/20200309095922.30269-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/line6/driver.c
sound/usb/line6/midibuf.c