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mfd: asic3: Fix potential null pointer dereference 

We previously assumed 'mem_sdio' could be null but it is
dereferenced in ioremap(). Add a check to avoid a potential
null pointer dereference error.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Sachin Kamat 2014-06-10 15:30:34 +05:30 committed by Lee Jones
parent 967580598f
commit 44b61a9f23
1 changed files with 7 additions and 5 deletions
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12
drivers/mfd/asic3.c
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@ -899,13 +899,15 @@ static int __init asic3_mfd_probe(struct platform_device *pdev,
ds1wm_resources[0].end >>= asic->bus_shift;
/* MMC */
asic->tmio_cnf = ioremap((ASIC3_SD_CONFIG_BASE >> asic->bus_shift) +
if (mem_sdio) {
asic->tmio_cnf = ioremap((ASIC3_SD_CONFIG_BASE >> asic->bus_shift) +
mem_sdio->start,
ASIC3_SD_CONFIG_SIZE >> asic->bus_shift);
if (!asic->tmio_cnf) {
ret = -ENOMEM;
dev_dbg(asic->dev, "Couldn't ioremap SD_CONFIG\n");
goto out;
if (!asic->tmio_cnf) {
ret = -ENOMEM;
dev_dbg(asic->dev, "Couldn't ioremap SD_CONFIG\n");
goto out;
}
}
asic3_mmc_resources[0].start >>= asic->bus_shift;
asic3_mmc_resources[0].end >>= asic->bus_shift;