ASoC: Jack: Fix NULL pointer dereference in snd_soc_jack_report

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@linux.intel.com>
Link: https://lore.kernel.org/r/20191112130237.10141-1-pawel.harlozinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

diff --git a/sound/soc/soc-jack.c b/sound/soc/soc-jack.c
index a71d2340eb050606b1d57866956f765e0bcdd5c2..b5748dcd490f22cfc87b6121a05ba281f6c86de0 100644 (file)
--- a/sound/soc/soc-jack.c
+++ b/sound/soc/soc-jack.c
@@ -82,10 +82,9 @@ void snd_soc_jack_report(struct snd_soc_jack *jack, int status, int mask)
        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;