On Thu, Feb 14, 2013 at 7:28 PM, Cong Ding <dinggnu@xxxxxxxxx> wrote:
> If it goes to eclk through line 1107, the variable res would be NULL. It will
> cause a null pointer dereference error if we call release_mem_region. The
> correct way should be using devm_kzalloc rather than kzalloc to allocate
> memory.
>
> Signed-off-by: Cong Ding <dinggnu@xxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-pxa.c | 22 ++++++++--------------
> 1 file changed, 8 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
> index 1034d93..dd2d640 100644
> --- a/drivers/i2c/busses/i2c-pxa.c
> +++ b/drivers/i2c/busses/i2c-pxa.c
> @@ -1094,29 +1094,23 @@ static int i2c_pxa_probe(struct platform_device *dev)
> struct resource *res = NULL;
> int ret, irq;
>
> - i2c = kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
> - if (!i2c) {
> - ret = -ENOMEM;
> - goto emalloc;
> - }
> + i2c = devm_kzalloc(sizeof(struct pxa_i2c), GFP_KERNEL);
> + if (!i2c)
> + return -ENOMEM;
>
> ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
> if (ret > 0)
> ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
> if (ret < 0)
> - goto eclk;
> + return ret;
>
> res = platform_get_resource(dev, IORESOURCE_MEM, 0);
> irq = platform_get_irq(dev, 0);
> - if (res == NULL || irq < 0) {
> - ret = -ENODEV;
> - goto eclk;
> - }
> + if (res == NULL || irq < 0)
> + return -ENODEV;
>
> - if (!request_mem_region(res->start, resource_size(res), res->name)) {
> - ret = -ENOMEM;
> - goto eclk;
> - }
> + if (!request_mem_region(res->start, resource_size(res), res->name))
> + return -ENOMEM;
>
> i2c->adap.owner = THIS_MODULE;
> i2c->adap.retries = 5;
> --
> 1.7.9.5
>
Acked-by: Haojian Zhuang <haojian.zhuang@xxxxxxxxx>
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