linux-kernel - [PATCH 5.15 014/107] ALSA: hda: intel-nhlt: Correct the handling of fmt

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Message-Id: <20220906132822.365219132@linuxfoundation.org>
Date:   Tue,  6 Sep 2022 15:29:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jaska Uimonen <jaska.uimonen@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 014/107] ALSA: hda: intel-nhlt: Correct the handling of fmt_config flexible array

From: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>

[ Upstream commit 2e6481a3f3ee6234ce577454e1d88aca55f51d47 ]

The struct nhlt_format's fmt_config is a flexible array, it must not be
used as normal array.
When moving to the next nhlt_fmt_cfg we need to take into account the data
behind the ->config.caps (indicated by ->config.size).

Fixes: a864e8f159b13 ("ALSA: hda: intel-nhlt: verify config type")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Jaska Uimonen <jaska.uimonen@...ux.intel.com>
Link: https://lore.kernel.org/r/20220823122405.18464-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/hda/intel-nhlt.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c
index 5e04fedaec49e..8714891f50b0a 100644
--- a/sound/hda/intel-nhlt.c
+++ b/sound/hda/intel-nhlt.c
@@ -55,16 +55,22 @@ int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt)
 
 		/* find max number of channels based on format_configuration */
 		if (fmt_configs->fmt_count) {
+			struct nhlt_fmt_cfg *fmt_cfg = fmt_configs->fmt_config;
+
 			dev_dbg(dev, "found %d format definitions\n",
 				fmt_configs->fmt_count);
 
 			for (i = 0; i < fmt_configs->fmt_count; i++) {
 				struct wav_fmt_ext *fmt_ext;
 
-				fmt_ext = &fmt_configs->fmt_config[i].fmt_ext;
+				fmt_ext = &fmt_cfg->fmt_ext;
 
 				if (fmt_ext->fmt.channels > max_ch)
 					max_ch = fmt_ext->fmt.channels;
+
+				/* Move to the next nhlt_fmt_cfg */
+				fmt_cfg = (struct nhlt_fmt_cfg *)(fmt_cfg->config.caps +
+								  fmt_cfg->config.size);
 			}
 			dev_dbg(dev, "max channels found %d\n", max_ch);
 		} else {
-- 
2.35.1