linux-kernel - [PATCH 4.9 127/199] ASoC: Jack: Fix NULL pointer dereference in snd_soc_jack

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Message-Id: <20191219183222.025663297@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:33:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Pawel Harlozinski <pawel.harlozinski@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.9 127/199] ASoC: Jack: Fix NULL pointer dereference in snd_soc_jack_report

From: Pawel Harlozinski <pawel.harlozinski@...ux.intel.com>

commit 8f157d4ff039e03e2ed4cb602eeed2fd4687a58f upstream.

Check for existance of jack before tracing.
NULL pointer dereference has been reported by KASAN while unloading
machine driver (snd_soc_cnl_rt274).

Signed-off-by: Pawel Harlozinski <pawel.harlozinski@...ux.intel.com>
Link: https://lore.kernel.org/r/20191112130237.10141-1-pawel.harlozinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/soc-jack.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/sound/soc/soc-jack.c
+++ b/sound/soc/soc-jack.c
@@ -80,10 +80,9 @@ void snd_soc_jack_report(struct snd_soc_
 	unsigned int sync = 0;
 	int enable;
 
-	trace_snd_soc_jack_report(jack, mask, status);
-
 	if (!jack)
 		return;
+	trace_snd_soc_jack_report(jack, mask, status);
 
 	dapm = &jack->card->dapm;