Subject: [PATCH] spi: add null check before pointer dereference

From: [email-masked] (Gustavo A. R. Silva)
Date: Mon, 22 May 2017 19:25:07 -0500

Add null check before dereferencing pointer desc

Addresses-Coverity-ID: 1397997
Signed-off-by: Gustavo A. R. Silva <[email-masked]>
---
 drivers/spi/spi-s3c64xx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index b392cca..9f1013e 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -306,6 +306,12 @@ 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) {
+		dev_err(&sdd->master->dev,
+			"%s:dmaengine_prep_slave_sg Failed\n", __func__);
+		return;
+	}
+
 	desc->callback = s3c64xx_spi_dmacb;
 	desc->callback_param = dma;
 
-- 
2.5.0