[PATCH] ASoC: Intel: avoid Oops if DMA setup fails

From: Ross Zwisler
Date: Fri Apr 26 2019 - 12:47:49 EST

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

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.

Signed-off-by: Ross Zwisler <zwisler@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
sound/soc/intel/common/sst-firmware.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/soc/intel/common/sst-firmware.c b/sound/soc/intel/common/sst-firmware.c
index 1e067504b6043..9be3a793a55e3 100644
--- a/sound/soc/intel/common/sst-firmware.c
+++ b/sound/soc/intel/common/sst-firmware.c
@@ -1251,11 +1251,15 @@ struct sst_dsp *sst_dsp_new(struct device *dev,
goto irq_err;

err = sst_dma_new(sst);
- if (err)
+ if (err) {
dev_warn(dev, "sst_dma_new failed %d\n", err);
+ goto dma_err;
+ }

return sst;

+ free_irq(sst->irq, sst);
if (sst->ops->free)