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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2016-02-06 02:36:35 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2016-02-08 15:22:04 +0100
commitb00663124c76f69e71d118d778842471e85c6f11 (patch)
treea3fc4c22c8cd254ff3d8f4dfdc0382fd663d3f15
parent2df9d58fcc0f20d812f390e0b97df69d70d3152f (diff)
mmc: mmc_spi: add checks for dma mapping error
There is no checks for dma mapping errors in mmc_spi. Tha patch fixes that and by the way it adds dma_unmap_single(ones_dma) that was left on a failure path mmc_spi_probe(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r--drivers/mmc/host/mmc_spi.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 1c1b45e..3446097 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -925,6 +925,10 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
dma_addr = dma_map_page(dma_dev, sg_page(sg), 0,
PAGE_SIZE, dir);
+ if (dma_mapping_error(dma_dev, dma_addr)) {
+ data->error = -EFAULT;
+ break;
+ }
if (direction == DMA_TO_DEVICE)
t->tx_dma = dma_addr + sg->offset;
else
@@ -1393,10 +1397,12 @@ static int mmc_spi_probe(struct spi_device *spi)
host->dma_dev = dev;
host->ones_dma = dma_map_single(dev, ones,
MMC_SPI_BLOCKSIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, host->ones_dma))
+ goto fail_ones_dma;
host->data_dma = dma_map_single(dev, host->data,
sizeof(*host->data), DMA_BIDIRECTIONAL);
-
- /* REVISIT in theory those map operations can fail... */
+ if (dma_mapping_error(dev, host->data_dma))
+ goto fail_data_dma;
dma_sync_single_for_cpu(host->dma_dev,
host->data_dma, sizeof(*host->data),
@@ -1462,6 +1468,11 @@ fail_glue_init:
if (host->dma_dev)
dma_unmap_single(host->dma_dev, host->data_dma,
sizeof(*host->data), DMA_BIDIRECTIONAL);
+fail_data_dma:
+ if (host->dma_dev)
+ dma_unmap_single(host->dma_dev, host->ones_dma,
+ MMC_SPI_BLOCKSIZE, DMA_TO_DEVICE);
+fail_ones_dma:
kfree(host->data);
fail_nobuf1: