linux-kernel - [PATCH] wcd9335: fix a incorrect use of kstrndup()

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Message-ID: <20190529015305.GA4700@zhanggen-UX430UQ>
Date:   Wed, 29 May 2019 09:53:05 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     broonie@...nel.org, lgirdwood@...il.com, perex@...ex.cz,
        wen.yang99@....com.cn
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] wcd9335: fix a incorrect use of kstrndup()

In wcd9335_codec_enable_dec(), 'widget_name' is allocated by kstrndup().
However, according to doc: "Note: Use kmemdup_nul() instead if the size
is known exactly." So we should use kmemdup_nul() here instead of
kstrndup().

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
---
diff --git a/sound/soc/codecs/wcd9335.c b/sound/soc/codecs/wcd9335.c
index a04a7ce..85737fe 100644
--- a/sound/soc/codecs/wcd9335.c
+++ b/sound/soc/codecs/wcd9335.c
@@ -2734,7 +2734,7 @@ static int wcd9335_codec_enable_dec(struct snd_soc_dapm_widget *w,
 	char *dec;
 	u8 hpf_coff_freq;
 
-	widget_name = kstrndup(w->name, 15, GFP_KERNEL);
+	widget_name = kmemdup_nul(w->name, 15, GFP_KERNEL);
 	if (!widget_name)
 		return -ENOMEM;
 
---