linux-kernel - [PATCH] ALSA: firewire-lib: Avoid division by zero in apply_constraint_to

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Message-Id: <20241018060018.1189537-1-shum.sdl@nppct.ru>
Date: Fri, 18 Oct 2024 09:00:18 +0300
From: Andrey Shumilin <shum.sdl@...ct.ru>
To: Clemens Ladisch <clemens@...isch.de>,
	Takashi Sakamoto <o-takashi@...amocchi.jp>
Cc: Andrey Shumilin <shum.sdl@...ct.ru>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	lvc-patches@...uxtesting.org,
	khoroshilov@...ras.ru,
	ykarpov@...ras.ru,
	vmerzlyakov@...ras.ru,
	vefanov@...ras.ru
Subject: [PATCH] ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size()

The step variable is initialized to zero. It is changed in the loop,
but if it's not changed it will remain zero. Add a variable check
before the division.

The observed behavior was introduced by commit 826b5de90c0b
("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size"),
and it is difficult to show that any of the interval parameters will
satisfy the snd_interval_test() condition with data from the
amdtp_rate_table[] table.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 826b5de90c0b ("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size")
Signed-off-by: Andrey Shumilin <shum.sdl@...ct.ru>
---
 sound/firewire/amdtp-stream.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 4e2f2bb7879f..6c45ee3545f9 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -163,6 +163,9 @@ static int apply_constraint_to_size(struct snd_pcm_hw_params *params,
 			step = max(step, amdtp_syt_intervals[i]);
 	}
 
+	if (step == 0)
+		return -EINVAL;
+
 	t.min = roundup(s->min, step);
 	t.max = rounddown(s->max, step);
 	t.integer = 1;
-- 
2.30.2