linux-kernel - [PATCH AUTOSEL 6.7 10/88] ASoC: SOF: icp3-dtrace: Fix wrong kfree() usage

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Date: Mon, 22 Jan 2024 09:50:43 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kamil Duljas <kamil.duljas@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	pierre-louis.bossart@...ux.intel.com,
	lgirdwood@...il.com,
	peter.ujfalusi@...ux.intel.com,
	yung-chuan.liao@...ux.intel.com,
	ranjani.sridharan@...ux.intel.com,
	daniel.baluta@....com,
	perex@...ex.cz,
	tiwai@...e.com,
	sound-open-firmware@...a-project.org,
	linux-sound@...r.kernel.org
Subject: [PATCH AUTOSEL 6.7 10/88] ASoC: SOF: icp3-dtrace: Fix wrong kfree() usage

From: Kamil Duljas <kamil.duljas@...il.com>

[ Upstream commit 8c91ca76f44804868d12aed20ebdbc2f89aa7d60 ]

trace_filter_parse() allocs memory for *out and when
-ENOMEM is returned, caller function, dfsentry_trace_filter_write()
trying to freed this memory.

After this patch, the memory is freed in trace_filter_parse()
before -EINVAL returned. In caller function removed kfree(elms)
from error label

Signed-off-by: Kamil Duljas <kamil.duljas@...il.com>
Link: https://lore.kernel.org/r/20231116220102.2097-2-kamil.duljas@gmail.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/sof/ipc3-dtrace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/ipc3-dtrace.c b/sound/soc/sof/ipc3-dtrace.c
index 0dca139322f3..93b189c2d2ee 100644
--- a/sound/soc/sof/ipc3-dtrace.c
+++ b/sound/soc/sof/ipc3-dtrace.c
@@ -137,6 +137,7 @@ static int trace_filter_parse(struct snd_sof_dev *sdev, char *string,
 			dev_err(sdev->dev,
 				"Parsing filter entry '%s' failed with %d\n",
 				entry, entry_len);
+			kfree(*out);
 			return -EINVAL;
 		}
 	}
@@ -208,13 +209,13 @@ static ssize_t dfsentry_trace_filter_write(struct file *file, const char __user
 		ret = ipc3_trace_update_filter(sdev, num_elems, elems);
 		if (ret < 0) {
 			dev_err(sdev->dev, "Filter update failed: %d\n", ret);
+			kfree(elems);
 			goto error;
 		}
 	}
 	ret = count;
 error:
 	kfree(string);
-	kfree(elems);
 	return ret;
 }
 
-- 
2.43.0