From e94769900f4302b4034945e5d9ec8262a2f5e086 Mon Sep 17 00:00:00 2001
From: Meng Tang <tangmeng@uniontech.com>
Date: Wed, 2 Mar 2022 17:43:51 +0800
Subject: [PATCH] ASoC: hdac_hda: Avoid unexpected match when pcm_name is "Analog"
Git-commit: e94769900f4302b4034945e5d9ec8262a2f5e086
Patch-mainline: v5.18-rc1
References: jsc#PED-850

pcm name can be "Analog" and "Alt Analog", cpcm->name can be
"Analog Codec DAI" and "Alt Analog Codec DAI". When pcm_name
is "Analog", "Analog Codec DAI" and "Alt Analog Codec DAI" are
both satisfy the 'if (strstr(cpcm->name, pcm_name))' condition,
which may cause the returned cpcm to be "Alt Analog Codec DAI".

Even if we get the pcm name by id, and "Analog Codec DAI" goes
into the loop before "Alt Analog Codec DAI", but I still think
we'd better have multiple insurances against unexpected return
values. After, we can correctly return the expected result
even if other relevant places are changed.

Signed-off-by: Meng Tang <tangmeng@uniontech.com>
Link: https://lore.kernel.org/r/20220302094351.3487-1-tangmeng@uniontech.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/hdac_hda.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/hdac_hda.c b/sound/soc/codecs/hdac_hda.c
index de5955db0a5f..402e049dfcd7 100644
--- a/sound/soc/codecs/hdac_hda.c
+++ b/sound/soc/codecs/hdac_hda.c
@@ -363,8 +363,13 @@ static struct hda_pcm *snd_soc_find_pcm_from_dai(struct hdac_hda_priv *hda_pvt,
 	}
 
 	list_for_each_entry(cpcm, &hcodec->pcm_list_head, list) {
-		if (strstr(cpcm->name, pcm_name))
+		if (strstr(cpcm->name, pcm_name)) {
+			if (strcmp(pcm_name, "Analog") == 0) {
+				if (strstr(cpcm->name, "Alt Analog"))
+					continue;
+			}
 			return cpcm;
+		}
 	}
 
 	dev_err(&hcodec->core.dev, "didn't find PCM for DAI %s\n", dai->name);
-- 
2.35.3