linux-kernel - [PATCH AUTOSEL 5.2 029/123] ASoC: dapm: fix a memory leak bug

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Date:   Tue, 13 Aug 2019 22:09:13 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wenwen Wang <wenwen@...uga.edu>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.2 029/123] ASoC: dapm: fix a memory leak bug

From: Wenwen Wang <wenwen@...uga.edu>

[ Upstream commit 45004d66f2a28d78f543fb2ffbc133e31dc2d162 ]

In snd_soc_dapm_new_control_unlocked(), a kernel buffer is allocated in
dapm_cnew_widget() to hold the new dapm widget. Then, different actions are
taken according to the id of the widget, i.e., 'w->id'. If any failure
occurs during this process, snd_soc_dapm_new_control_unlocked() should be
terminated by going to the 'request_failed' label. However, the allocated
kernel buffer is not freed on this code path, leading to a memory leak bug.

To fix the above issue, free the buffer before returning from
snd_soc_dapm_new_control_unlocked() through the 'request_failed' label.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
Link: https://lore.kernel.org/r/1563803864-2809-1-git-send-email-wang6495@umn.edu
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/soc-dapm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 835ce1ff188d9..f40adb604c25b 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3705,6 +3705,8 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 		dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
 			w->name, ret);

+	kfree_const(w->sname);
+	kfree(w);
 	return ERR_PTR(ret);
 }

-- 
2.20.1