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authorRoss Zwisler <zwisler@chromium.org>2019-04-29 12:25:17 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-10 17:52:10 +0200
commitbab022db454a4c074054f30344416f12821ca11f (patch)
parent361622eeff6cb736d6517e5cad7e6fbfe2cc2381 (diff)
ASoC: Intel: avoid Oops if DMA setup fails
commit 0efa3334d65b7f421ba12382dfa58f6ff5bf83c4 upstream. Currently in sst_dsp_new() if we get an error return from sst_dma_new() we just print an error message and then still complete the function successfully. This means that we are trying to run without sst->dma properly set up, which will result in NULL pointer dereference when sst->dma is later used. This was happening for me in sst_dsp_dma_get_channel(): struct sst_dma *dma = dsp->dma; ... dma->ch = dma_request_channel(mask, dma_chan_filter, dsp); This resulted in: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: sst_dsp_dma_get_channel+0x4f/0x125 [snd_soc_sst_firmware] Fix this by adding proper error handling for the case where we fail to set up DMA. This change only affects Haswell and Broadwell systems. Baytrail systems explicilty opt-out of DMA via sst->pdata->resindex_dma_base being set to -1. Signed-off-by: Ross Zwisler <zwisler@google.com> Cc: stable@vger.kernel.org Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 6 insertions, 2 deletions
diff --git a/sound/soc/intel/common/sst-firmware.c b/sound/soc/intel/common/sst-firmware.c
index 79a9fdf94d38..582b30a5118d 100644
--- a/sound/soc/intel/common/sst-firmware.c
+++ b/sound/soc/intel/common/sst-firmware.c
@@ -1252,11 +1252,15 @@ struct sst_dsp *sst_dsp_new(struct device *dev,
goto irq_err;
err = sst_dma_new(sst);
- if (err)
- dev_warn(dev, "sst_dma_new failed %d\n", err);
+ if (err) {
+ dev_err(dev, "sst_dma_new failed %d\n", err);
+ goto dma_err;
+ }
return sst;
+ free_irq(sst->irq, sst);
if (sst->ops->free)