On Wed, 28 Aug 2013, Philippe De Swert wrote:
> When an error occurs adding a platform device there is a risk of an infinite
> loop.
> If more than one platform device was added i will remain >= than 0. The
> intention seems
> to clean up all the different already added platform devices before the
> failure occurs,
> so fixed the code to actually do so. We decrement first because the adding at
> the current
> index of i is the one that failed.
>
> Found with coverity : CID 751073
>
> Signed-off-by: Philippe De Swert <[email protected]>
> ---
> drivers/usb/gadget/dummy_hcd.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
> index c588e8e..5c506fb 100644
> --- a/drivers/usb/gadget/dummy_hcd.c
> +++ b/drivers/usb/gadget/dummy_hcd.c
> @@ -2705,9 +2705,10 @@ static int __init init(void)
> for (i = 0; i < mod_data.num; i++) {
> retval = platform_device_add(the_udc_pdev[i]);
> if (retval < 0) {
> - i--;
> - while (i >= 0)
> + while (i >= 0) {
> + i--;
> platform_device_del(the_udc_pdev[i]);
> + }
> goto err_add_udc;
> }
> }
This is definitely a bug, but you should have fixed it the same way as
the code 21 lines earlier. Or even better, change both of them to use
this pattern:
if (retval < 0) {
while (--i >= 0)
platform_device_del(the_udc_pdev[i]);
goto err_add_udc;
}
Alan Stern
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