Messages in this thread Patch in this message | | | From | Kangjie Lu <> | Subject | [PATCH] spi: fix NULL pointer dereferences by checking dmaengine_prep_slave_sg | Date | Thu, 14 Mar 2019 01:42:01 -0500 |
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In case dmaengine_prep_slave_sg fails, the fix returns to avoid NULL pointer dereference.
Signed-off-by: Kangjie Lu <kjlu@umn.edu> --- drivers/spi/spi-s3c64xx.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 7b7151ec14c8..3a5f161ce558 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -293,6 +293,8 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma, desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents, dma->direction, DMA_PREP_INTERRUPT); + if (!desc) + return; desc->callback = s3c64xx_spi_dmacb; desc->callback_param = dma; -- 2.17.1
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