linux-kernel - [PATCH] ASoC: audio-graph-card2: fix off by one in graph_parse_node_multi

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Date:   Mon, 4 Dec 2023 15:42:07 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Rob Herring <robh@...nel.org>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-sound@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] ASoC: audio-graph-card2: fix off by one in
 graph_parse_node_multi_nm()

The > comparison should be >= to avoid writing one element beyond the end
of the dai_link->ch_maps[] array.  The dai_link->ch_maps[] array is
allocated in graph_parse_node_multi() and it has "nm_max" elements.

Fixes: e2de6808df4a ("ASoC: audio-graph-card2: add CPU:Codec = N:M support")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
In this same function I was also concerned about these conditions:

if (cpu_idx > dai_link->num_cpus)
if (codec_idx > dai_link->num_codecs)

But I wasn't able to see out how those idx variables are actually
used.

 sound/soc/generic/audio-graph-card2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c
index d9e10308a508..78d9679decda 100644
--- a/sound/soc/generic/audio-graph-card2.c
+++ b/sound/soc/generic/audio-graph-card2.c
@@ -557,7 +557,7 @@ static int graph_parse_node_multi_nm(struct snd_soc_dai_link *dai_link,
 		struct device_node *mcodec_port;
 		int codec_idx;
 
-		if (*nm_idx > nm_max)
+		if (*nm_idx >= nm_max)
 			break;
 
 		mcpu_ep_n = of_get_next_child(mcpu_port, mcpu_ep_n);
-- 
2.42.0