linux-kernel - [PATCH][next] ASoC: rsnd: check for zero node count

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Message-Id: <20210602103722.12128-1-colin.king@canonical.com>
Date:   Wed,  2 Jun 2021 11:37:22 +0100
From:   Colin King <colin.king@...onical.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] ASoC: rsnd: check for zero node count

From: Colin Ian King <colin.king@...onical.com>

The call to rsnd_node_count can potentially return a zero node count
so add a check for this corner case. (Note that the two other calls
to rsnd_node_count in the kernel perform this check, so I think it
justifies adding this). This avoids using a zero nr in a devm_kcalloc
call.

Addresses-Coverity: ("Unchecked return value")
Fixes: c413983eb66a ("ASoC: rsnd: adjust disabled module")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/soc/sh/rcar/ssiu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/sh/rcar/ssiu.c b/sound/soc/sh/rcar/ssiu.c
index 5682c74bb7ff..0d8f97633dd2 100644
--- a/sound/soc/sh/rcar/ssiu.c
+++ b/sound/soc/sh/rcar/ssiu.c
@@ -515,6 +515,9 @@ int rsnd_ssiu_probe(struct rsnd_priv *priv)
 	else
 		nr = priv->ssi_nr;
 
+	if (!nr)
+		return -EINVAL;
+
 	ssiu	= devm_kcalloc(dev, nr, sizeof(*ssiu), GFP_KERNEL);
 	if (!ssiu)
 		return -ENOMEM;
-- 
2.31.1