linux-kernel - [PATCH] ASoC: mediatek: common: Fix refcount leak in parse_dai_link

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Message-ID: <20230411003431.4048700-1-shraash@google.com>
Date:   Tue, 11 Apr 2023 06:04:31 +0530
From:   Aashish Sharma <shraash@...gle.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Trevor Wu <trevor.wu@...iatek.com>,
        Guenter Roeck <groeck@...omium.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Aashish Sharma <shraash@...gle.com>,
        kernel test robot <lkp@...el.com>,
        Julia Lawall <julia.lawall@...ia.fr>
Subject: [PATCH] ASoC: mediatek: common: Fix refcount leak in parse_dai_link_info

Add missing of_node_put()s before the returns to balance
of_node_get()s and of_node_put()s, which may get unbalanced
in case the for loop 'for_each_available_child_of_node' returns
early.

Fixes: 4302187d955f ("ASoC: mediatek: common: add soundcard driver common code")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Julia Lawall <julia.lawall@...ia.fr>
Link: https://lore.kernel.org/r/202304090504.2K8L6soj-lkp@intel.com/
Signed-off-by: Aashish Sharma <shraash@...gle.com>
---
 sound/soc/mediatek/common/mtk-soundcard-driver.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/sound/soc/mediatek/common/mtk-soundcard-driver.c b/sound/soc/mediatek/common/mtk-soundcard-driver.c
index 7c55c2cb1f21..738093451ccb 100644
--- a/sound/soc/mediatek/common/mtk-soundcard-driver.c
+++ b/sound/soc/mediatek/common/mtk-soundcard-driver.c
@@ -47,20 +47,26 @@ int parse_dai_link_info(struct snd_soc_card *card)
 	/* Loop over all the dai link sub nodes */
 	for_each_available_child_of_node(dev->of_node, sub_node) {
 		if (of_property_read_string(sub_node, "link-name",
-					    &dai_link_name))
+					    &dai_link_name)) {
+			of_node_put(sub_node);
 			return -EINVAL;
+		}
 
 		for_each_card_prelinks(card, i, dai_link) {
 			if (!strcmp(dai_link_name, dai_link->name))
 				break;
 		}
 
-		if (i >= card->num_links)
+		if (i >= card->num_links) {
+			of_node_put(sub_node);
 			return -EINVAL;
+		}
 
 		ret = set_card_codec_info(card, sub_node, dai_link);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(sub_node);
 			return ret;
+		}
 	}
 
 	return 0;
-- 
2.40.0.577.gac1e443424-goog