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nvmem: sunxi: Check for memory allocation failure 

The sunxi_sid driver doesn't check for kmalloc return status before
derefencing the returned pointer, which could lead to a NULL pointer
dereference if kmalloc failed. Check for its return code to make sure it
deosn't happen.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maxime Ripard 2015-09-30 13:36:31 +01:00 committed by Greg Kroah-Hartman
parent ace2217065
commit fb727077b0
1 changed files with 10 additions and 1 deletions
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11
drivers/nvmem/sunxi_sid.c
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@ -103,7 +103,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
struct nvmem_device *nvmem;
struct regmap *regmap;
struct sunxi_sid *sid;
int i, size;
int ret, i, size;
char *randomness;
sid = devm_kzalloc(dev, sizeof(*sid), GFP_KERNEL);
@ -131,6 +131,11 @@ static int sunxi_sid_probe(struct platform_device *pdev)
return PTR_ERR(nvmem);
randomness = kzalloc(sizeof(u8) * size, GFP_KERNEL);
if (!randomness) {
ret = -EINVAL;
goto err_unreg_nvmem;
}
for (i = 0; i < size; i++)
randomness[i] = sunxi_sid_read_byte(sid, i);
@ -140,6 +145,10 @@ static int sunxi_sid_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, nvmem);
return 0;
err_unreg_nvmem:
nvmem_unregister(nvmem);
return ret;
}
static int sunxi_sid_remove(struct platform_device *pdev)