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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jaroslav Kysela <perex@perex.cz>
Cc: alsa-devel@alsa-project.org, kernel-janitors@vger.kernel.org,
	Takashi Iwai <tiwai@suse.com>
Subject: [PATCH] ALSA: synth: emux: soundfont.c: divide by zero in calc_gus_envelope_time()
Date: Mon, 06 May 2019 12:51:19 +0000	[thread overview]
Message-ID: <20190506125119.GB13799@mwanda> (raw)

This function is called from load_guspatch() and the rate is specified
by the user.  If they accidentally selected zero then it would crash the
kernel.  I've just changed the zero to a one.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 sound/synth/emux/soundfont.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/synth/emux/soundfont.c b/sound/synth/emux/soundfont.c
index 31a4ea94830e..9b5d70104489 100644
--- a/sound/synth/emux/soundfont.c
+++ b/sound/synth/emux/soundfont.c
@@ -856,6 +856,8 @@ calc_gus_envelope_time(int rate, int start, int end)
 	int r, p, t;
 	r = (3 - ((rate >> 6) & 3)) * 3;
 	p = rate & 0x3f;
+	if (!p)
+		p = 1;
 	t = end - start;
 	if (t < 0) t = -t;
 	if (13 > r)
-- 
2.18.0

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jaroslav Kysela <perex@perex.cz>
Cc: alsa-devel@alsa-project.org, kernel-janitors@vger.kernel.org,
	Takashi Iwai <tiwai@suse.com>
Subject: [PATCH] ALSA: synth: emux: soundfont.c: divide by zero in calc_gus_envelope_time()
Date: Mon, 6 May 2019 15:51:19 +0300	[thread overview]
Message-ID: <20190506125119.GB13799@mwanda> (raw)

This function is called from load_guspatch() and the rate is specified
by the user.  If they accidentally selected zero then it would crash the
kernel.  I've just changed the zero to a one.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 sound/synth/emux/soundfont.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/synth/emux/soundfont.c b/sound/synth/emux/soundfont.c
index 31a4ea94830e..9b5d70104489 100644
--- a/sound/synth/emux/soundfont.c
+++ b/sound/synth/emux/soundfont.c
@@ -856,6 +856,8 @@ calc_gus_envelope_time(int rate, int start, int end)
 	int r, p, t;
 	r = (3 - ((rate >> 6) & 3)) * 3;
 	p = rate & 0x3f;
+	if (!p)
+		p = 1;
 	t = end - start;
 	if (t < 0) t = -t;
 	if (13 > r)
-- 
2.18.0

             reply	other threads:[~2019-05-06 12:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-06 12:51 Dan Carpenter [this message]
2019-05-06 12:51 ` [PATCH] ALSA: synth: emux: soundfont.c: divide by zero in calc_gus_envelope_time() Dan Carpenter
2019-05-06 13:01 ` Takashi Iwai
2019-05-06 13:01   ` Takashi Iwai

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