Commit 7b821a64 authored by Amelie Delaunay's avatar Amelie Delaunay Committed by Mark Brown
Browse files

spi: stm32: fix potential dereference null return value 



This patch fixes the usage of rx_dma_desc and tx_dma_desc pointers
returned by dmaengine_prep_slave_sg, which can be null.

Detected by CoverityScan, CID#1446587 ("Dereference null return value")

Reported-by: default avatarColin Ian King <colin.king@canonical.com>
Signed-off-by: default avatarAmelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent c67ad368

drivers/spi/spi-stm32.c

+8 −8
Original line number Diff line number Diff line
@@ -775,9 +775,6 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi, 
					xfer->rx_sg.nents,

					rx_dma_conf.direction,

					DMA_PREP_INTERRUPT);



		rx_dma_desc->callback = stm32_spi_dma_cb;

		rx_dma_desc->callback_param = spi;

	}



	tx_dma_desc = NULL;
@@ -790,11 +787,6 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi, 
					xfer->tx_sg.nents,

					tx_dma_conf.direction,

					DMA_PREP_INTERRUPT);



		if (spi->cur_comm == SPI_SIMPLEX_TX) {

			tx_dma_desc->callback = stm32_spi_dma_cb;

			tx_dma_desc->callback_param = spi;

		}

	}



	if ((spi->tx_buf && !tx_dma_desc) ||
@@ -802,6 +794,9 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi, 
		goto dma_desc_error;



	if (rx_dma_desc) {

		rx_dma_desc->callback = stm32_spi_dma_cb;

		rx_dma_desc->callback_param = spi;



		if (dma_submit_error(dmaengine_submit(rx_dma_desc))) {

			dev_err(spi->dev, "Rx DMA submit failed\n");

			goto dma_desc_error;
@@ -811,6 +806,11 @@ static int stm32_spi_transfer_one_dma(struct stm32_spi *spi, 
	}



	if (tx_dma_desc) {

		if (spi->cur_comm == SPI_SIMPLEX_TX) {

			tx_dma_desc->callback = stm32_spi_dma_cb;

			tx_dma_desc->callback_param = spi;

		}



		if (dma_submit_error(dmaengine_submit(tx_dma_desc))) {

			dev_err(spi->dev, "Tx DMA submit failed\n");

			goto dma_submit_error;

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