linux-kernel - [PATCH 2/3] ALSA: pcm: Fix snd_pcm_format

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Date: Thu, 25 Jan 2024 22:35:20 +0000
From: Ivan Orlov <ivan.orlov0322@...il.com>
To: perex@...ex.cz,
	tiwai@...e.com
Cc: Ivan Orlov <ivan.orlov0322@...il.com>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] ALSA: pcm: Fix snd_pcm_format_name function

Fix snd_pcm_format_name so it won't return NULL-pointer in case if it
can't find the format in the 'snd_pcm_format_names' list. Return
"Unknown" instead, as it is done if the number passed to the function
is larger than a list size.

Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
---
 sound/core/pcm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index d0788126cbab..d9b338088d10 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -225,9 +225,11 @@ static const char * const snd_pcm_format_names[] = {
  */
 const char *snd_pcm_format_name(snd_pcm_format_t format)
 {
-	if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
+	unsigned int format_num = (__force unsigned int)format;
+
+	if (format_num >= ARRAY_SIZE(snd_pcm_format_names) || !snd_pcm_format_names[format_num])
 		return "Unknown";
-	return snd_pcm_format_names[(__force unsigned int)format];
+	return snd_pcm_format_names[format_num];
 }
 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
 
-- 
2.34.1