On Thu, 2010-08-12 at 09:46 +0200, Dan Carpenter wrote:
> There were a couple issues here. If the allocation failed for "dev"
> then it would lead to a NULL dereference. If request_irq() or
> request_region() failed it would release the irq and the region even
> though they were not successfully aquired.
>
> Signed-off-by: Dan Carpenter <erro...@gmail.com>
I don't think this is needed.
I just alloc all the stuff, and if one of allocations fail, I free them
all. {k}free on NULL pointer is perfectly legal.
Same about IO and IRQ.
IRQ0 and IO 0 isn't valid, and I do test that in error path.
Best regards,
Maxim Levitsky
>
> diff --git a/drivers/media/IR/ene_ir.c b/drivers/media/IR/ene_ir.c
> index 5447750..8e5e964 100644
> --- a/drivers/media/IR/ene_ir.c
> +++ b/drivers/media/IR/ene_ir.c
> @@ -781,21 +781,24 @@ static int ene_probe(struct pnp_dev *pnp_dev, const
> struct pnp_device_id *id)
>
> /* allocate memory */
> input_dev = input_allocate_device();
> + if (!input_dev)
> + goto err_out;
> ir_props = kzalloc(sizeof(struct ir_dev_props), GFP_KERNEL);
> + if (!ir_props)
> + goto err_input_dev;
> dev = kzalloc(sizeof(struct ene_device), GFP_KERNEL);
> -
> - if (!input_dev || !ir_props || !dev)
> - goto error;
> + if (!dev)
> + goto err_ir_props;
>
> /* validate resources */
> error = -ENODEV;
>
> if (!pnp_port_valid(pnp_dev, 0) ||
> pnp_port_len(pnp_dev, 0) < ENE_MAX_IO)
> - goto error;
> + goto err_dev;
>
> if (!pnp_irq_valid(pnp_dev, 0))
> - goto error;
> + goto err_dev;
>
> dev->hw_io = pnp_port_start(pnp_dev, 0);
> dev->irq = pnp_irq(pnp_dev, 0);
> @@ -804,11 +807,11 @@ static int ene_probe(struct pnp_dev *pnp_dev, const
> struct pnp_device_id *id)
> /* claim the resources */
> error = -EBUSY;
> if (!request_region(dev->hw_io, ENE_MAX_IO, ENE_DRIVER_NAME))
> - goto error;
> + goto err_dev;
>
> if (request_irq(dev->irq, ene_isr,
> IRQF_SHARED, ENE_DRIVER_NAME, (void *)dev))
> - goto error;
> + goto err_region;
>
> pnp_set_drvdata(pnp_dev, dev);
> dev->pnp_dev = pnp_dev;
> @@ -816,7 +819,7 @@ static int ene_probe(struct pnp_dev *pnp_dev, const
> struct pnp_device_id *id)
> /* detect hardware version and features */
> error = ene_hw_detect(dev);
> if (error)
> - goto error;
> + goto err_irq;
>
> ene_setup_settings(dev);
>
> @@ -889,20 +892,22 @@ static int ene_probe(struct pnp_dev *pnp_dev, const
> struct pnp_device_id *id)
> error = -ENODEV;
> if (ir_input_register(input_dev, RC_MAP_RC6_MCE, ir_props,
> ENE_DRIVER_NAME))
> - goto error;
> -
> + goto err_irq;
>
> ene_printk(KERN_NOTICE, "driver has been succesfully loaded\n");
> return 0;
> -error:
> - if (dev->irq)
> - free_irq(dev->irq, dev);
> - if (dev->hw_io)
> - release_region(dev->hw_io, ENE_MAX_IO);
>
> - input_free_device(input_dev);
> - kfree(ir_props);
> +err_irq:
> + free_irq(dev->irq, dev);
> +err_region:
> + release_region(dev->hw_io, ENE_MAX_IO);
> +err_dev:
> kfree(dev);
> +err_ir_props:
> + kfree(ir_props);
> +err_input_dev:
> + input_free_device(input_dev);
> +err_out:
> return error;
> }
>
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