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[v7,1/9] ASoC: hdac_hdmi: Fix possible memory leak in hw_params

Message ID 1455725047-7303-2-git-send-email-subhransu.s.prusty@intel.com (mailing list archive)
State Accepted
Commit 6793a3d70676c6f3d2ec0ce4e1e241617541702c
Headers show

Commit Message

Subhransu S. Prusty Feb. 17, 2016, 4:03 p.m. UTC 
It's possible for hw_params to be called two times. So add NULL
check to prevent memory leak.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---
 sound/soc/codecs/hdac_hdmi.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)
diff mbox

Patch

diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
index 2884dbf..d2a2e18 100644
--- a/sound/soc/codecs/hdac_hdmi.c
+++ b/sound/soc/codecs/hdac_hdmi.c
@@ -405,9 +405,13 @@  static int hdac_hdmi_set_hw_params(struct snd_pcm_substream *substream,
 		return -ENODEV;
 	}
 
-	dd = kzalloc(sizeof(*dd), GFP_KERNEL);
-	if (!dd)
-		return -ENOMEM;
+	dd = snd_soc_dai_get_dma_data(dai, substream);
+	if (!dd) {
+		dd = kzalloc(sizeof(*dd), GFP_KERNEL);
+		if (!dd)
+			return -ENOMEM;
+	}
+
 	dd->format = snd_hdac_calc_stream_format(params_rate(hparams),
 			params_channels(hparams), params_format(hparams),
 			24, 0);
@@ -433,9 +437,11 @@  static int hdac_hdmi_playback_cleanup(struct snd_pcm_substream *substream,
 				AC_VERB_SET_STREAM_FORMAT, 0);
 
 	dd = (struct hdac_ext_dma_params *)snd_soc_dai_get_dma_data(dai, substream);
-	snd_soc_dai_set_dma_data(dai, substream, NULL);
 
-	kfree(dd);
+	if (dd) {
+		snd_soc_dai_set_dma_data(dai, substream, NULL);
+		kfree(dd);
+	}
 
 	return 0;
 }