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mmc: dw_mmc-pltfm: fix the potential NULL pointer dereference

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platform_get_resource can be returned the NULL pointer.
Then regs->start should be referred to NULL Pointer.
devm_ioremap_resource() checks whether res is NULL or not.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jaehoon Chung 2016-10-21 19:57:57 +09:00 committed by Ulf Hansson
parent 07d9a38068
commit 45c7a4908a
1 changed files with 3 additions and 2 deletions
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5
drivers/mmc/host/dw_mmc-pltfm.c
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@ -46,12 +46,13 @@ int dw_mci_pltfm_register(struct platform_device *pdev,
host->pdata = pdev->dev.platform_data;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* Get registers' physical base address */
host->phy_regs = regs->start;
host->regs = devm_ioremap_resource(&pdev->dev, regs);
if (IS_ERR(host->regs))
return PTR_ERR(host->regs);
/* Get registers' physical base address */
host->phy_regs = regs->start;
platform_set_drvdata(pdev, host);
return dw_mci_probe(host);
}