Re: [Qemu-devel] [PATCH 2/3] hw/s390x: fix memory leak in s390_init_ipl_dev()

[Igor Mammedov <imammedo@redhat.com>]

On Thu, 29 Mar 2018 11:10:06 +0200
Greg Kurz <groug@kaod.org> wrote:

> The string returned by object_property_get_str() is dynamically allocated.
> 
> Fixes: 3c4e9baacf4d9
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
>  hw/s390x/s390-virtio-ccw.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
> index 864145a7c6f3..435f7c99e77c 100644
> --- a/hw/s390x/s390-virtio-ccw.c
> +++ b/hw/s390x/s390-virtio-ccw.c
> @@ -246,6 +246,7 @@ static void s390_init_ipl_dev(const char *kernel_filename,
>  {
>      Object *new = object_new(TYPE_S390_IPL);
>      DeviceState *dev = DEVICE(new);
> +    char *netboot_fw_prop;
>  
>      if (kernel_filename) {
>          qdev_prop_set_string(dev, "kernel", kernel_filename);
> @@ -256,9 +257,11 @@ static void s390_init_ipl_dev(const char *kernel_filename,
>      qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
>      qdev_prop_set_string(dev, "firmware", firmware);
>      qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
> -    if (!strlen(object_property_get_str(new, "netboot_fw", &error_abort))) {
> +    netboot_fw_prop = object_property_get_str(new, "netboot_fw", &error_abort);
> +    if (!strlen(netboot_fw_prop)) {
probably not really issue here but,
is strlen really safe in case netboot_fw_prop == NULL?

>          qdev_prop_set_string(dev, "netboot_fw", netboot_fw);
>      }
> +    g_free(netboot_fw_prop);
>      object_property_add_child(qdev_get_machine(), TYPE_S390_IPL,
>                                new, NULL);
>      object_unref(new);
> 
>