linux-kernel - [PATCH 1/4] ASoC: codec2codec: avoid invalid/double-free of pcm runtime

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Message-Id: <20200213061147.29386-2-samuel@sholland.org>
Date:   Thu, 13 Feb 2020 00:11:44 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Jerome Brunet <jbrunet@...libre.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Samuel Holland <samuel@...lland.org>, stable@...r.kernel.org
Subject: [PATCH 1/4] ASoC: codec2codec: avoid invalid/double-free of pcm runtime

The PCM runtime was freed during PMU in the case that the event hook
encountered an error. However, it is also unconditionally freed during
PMD. Avoid a double-free by dropping the call to kfree in the PMU hook.

Fixes: a72706ed8208 ("ASoC: codec2codec: remove ephemeral variables")
Cc: stable@...r.kernel.org
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
 sound/soc/soc-dapm.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index b6378f025836..935b5375ecc5 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3888,9 +3888,6 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
 	runtime->rate = params_rate(params);
 
 out:
-	if (ret < 0)
-		kfree(runtime);
-
 	kfree(params);
 	return ret;
 }
-- 
2.24.1