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mmc: atmel-mci: Check pdata for NULL before dereferencing it at DMA config

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Using an at91sam9g20ek development board with DTS configuration may trigger
a kernel panic because of a NULL pointer dereference exception, while
configuring DMA. Let's fix this by adding a check for pdata before
dereferencing it.

Signed-off-by: Brent Taylor <motobud@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Brent Taylor 2016-03-13 00:25:31 -06:00 committed by Ulf Hansson
parent a0747eb81c
commit 93c77d2999
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/host/atmel-mci.c
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@ -2438,7 +2438,7 @@ static int atmci_configure_dma(struct atmel_mci *host)
struct mci_platform_data *pdata = host->pdev->dev.platform_data; struct mci_platform_data *pdata = host->pdev->dev.platform_data;
dma_cap_mask_t mask; dma_cap_mask_t mask;
if (!pdata->dma_filter) if (!pdata || !pdata->dma_filter)
return -ENODEV; return -ENODEV;
dma_cap_zero(mask); dma_cap_zero(mask);