From: Takashi Iwai <tiwai@suse.de>

Subject: readmidi: Fix division by zero

References: CVE-2017-11546

An adhoc fix for division by zero in insert_note_steps().

Signed-off-by: Takashi Iwai <tiwai@suse.de>

---

 timidity/readmidi.c |    2 ++

 1 file changed, 2 insertions(+)

--- a/timidity/readmidi.c

+++ b/timidity/readmidi.c

@@ -4585,6 +4585,8 @@ static void insert_note_steps(void)

 			if (beat != 0)

 				meas++, beat = 0;

 			num = timesig[n].a, denom = timesig[n].b, n++;

+			if (!denom)

+				denom = 1;

 		}

 		a = (meas + 1) & 0xff;

 		b = (((meas + 1) >> 8) & 0x0f) + ((beat + 1) << 4);