linux-kernel - [PATCH][next][V2] ASoC: rsnd: check for zero node count

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Message-Id: <20210603110315.81146-1-colin.king@canonical.com>
Date:   Thu,  3 Jun 2021 12:03:15 +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][V2] ASoC: rsnd: check for zero node count

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

Most callers of_get_child_count() check that "nr" is non-zero so it
causes a static checker warning when we don't do that here.  This
does not cause a problem or a crash, but having zero SSUIes does not
make sense either so let's add a check.

Addresses-Coverity: ("Unchecked return value")
Fixes: c413983eb66a ("ASoC: rsnd: adjust disabled module")
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
V2: Rephrase commit message based on Dan Carpenter's suggestion.
    Thanks Dan!
---

 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