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spi: imx: Fix possible NULL pointer deref

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transfer could be NULL in spi_imx_can_dma() when it's called from
spi_imx_setupxfer() with a NULL transfer. Test for a NULL pointer before
dereferencing it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sascha Hauer 2016-03-17 09:21:50 +01:00 committed by Mark Brown
parent 793c7f9212
commit cd8dd41a33
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/spi-imx.c
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@ -211,11 +211,15 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *transfer)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
unsigned int bpw = transfer->bits_per_word;
unsigned int bpw;
if (!master->dma_rx)
return false;
if (!transfer)
return false;
bpw = transfer->bits_per_word;
if (!bpw)
bpw = spi->bits_per_word;