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| author | M'boumba Cedric Madianga <cedric.madianga@gmail.com> | 2015-12-07 12:00:28 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-12-10 09:45:22 +0530 |
| commit | aea08a5dfadf387153cdbbff89f775b0e19d32e4 (patch) | |
| tree | e131357f4158ae6de8a7ce51b06983ca80c48dc1 /drivers/dma/stm32-dma.c | |
| parent | b341b4a13ca2c6ea8a426a9befb4dec0d7040860 (diff) | |
| download | linux-aea08a5dfadf387153cdbbff89f775b0e19d32e4.tar.gz | |
dmaengine: stm32-dma: Fix unchecked deference of chan->desc
'commit d8b468394fb7 ("dmaengine: Add STM32 DMA driver")' leads to the
following Smatch complaint:
drivers/dma/stm32-dma.c:562 stm32_dma_issue_pending()
error: we previously assumed 'chan->desc' could be null (see line 560)
So, this patch fixes the unchecked dereference of chan->desc by returning
operation not permitted error when stm32_dma_start_transfer() does not
succeed to allocate a virtual channel descriptor.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/stm32-dma.c')
| -rw-r--r-- | drivers/dma/stm32-dma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 12f3a3eddba9..047476a1383d 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -437,7 +437,7 @@ static int stm32_dma_start_transfer(struct stm32_dma_chan *chan) if (!chan->desc) { vdesc = vchan_next_desc(&chan->vchan); if (!vdesc) - return 0; + return -EPERM; chan->desc = to_stm32_dma_desc(vdesc); chan->next_sg = 0; @@ -559,7 +559,7 @@ static void stm32_dma_issue_pending(struct dma_chan *c) if (!chan->busy) { if (vchan_issue_pending(&chan->vchan) && !chan->desc) { ret = stm32_dma_start_transfer(chan); - if ((chan->desc->cyclic) && (!ret)) + if ((!ret) && (chan->desc->cyclic)) stm32_dma_configure_next_sg(chan); } } |