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);