linux-kernel - [PATCH] ALSA: intel_hdmi: Fix off-by-one error in __hdmi_lpe_audio

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Message-ID: <20250805190809.31150-1-thorsten.blum@linux.dev>
Date: Tue,  5 Aug 2025 21:08:06 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Thorsten Blum <thorsten.blum@...ux.dev>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Joe Perches <joe@...ches.com>
Cc: stable@...r.kernel.org,
	Takashi Iwai <tiwai@...e.de>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ALSA: intel_hdmi: Fix off-by-one error in __hdmi_lpe_audio_probe()

In __hdmi_lpe_audio_probe(), strscpy() is incorrectly called with the
length of the source string (excluding the NUL terminator) rather than
the size of the destination buffer. This results in one character less
being copied from 'card->shortname' to 'pcm->name'.

Since 'pcm->name' is a fixed-size buffer, we can safely omit the size
argument and let strscpy() infer it using sizeof(). This ensures the
card name is copied correctly.

Cc: stable@...r.kernel.org
Fixes: 75b1a8f9d62e ("ALSA: Convert strlcpy to strscpy when return value is unused")
Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 sound/x86/intel_hdmi_audio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c
index cc54539c6030..fbef0cbe8f1a 100644
--- a/sound/x86/intel_hdmi_audio.c
+++ b/sound/x86/intel_hdmi_audio.c
@@ -1765,7 +1765,7 @@ static int __hdmi_lpe_audio_probe(struct platform_device *pdev)
 		/* setup private data which can be retrieved when required */
 		pcm->private_data = ctx;
 		pcm->info_flags = 0;
-		strscpy(pcm->name, card->shortname, strlen(card->shortname));
+		strscpy(pcm->name, card->shortname);
 		/* setup the ops for playback */
 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &had_pcm_ops);
 
-- 
2.50.1