Re: [Qemu-devel] [PATCH] hw/vfio/platform: replace g_malloc0_n by g_malloc0

[Markus Armbruster <armbru@redhat.com>]

Eric Auger <eric.auger@linaro.org> writes:

> g_malloc0_n() is introduced since glib-2.24 while QEMU currently
> requires glib-2.22. This may cause a link error on some distributions.
>
> Signed-off-by: Eric Auger <eric.auger@linaro.org>
> ---
>  hw/vfio/platform.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
> index 35266a8..c0acc8b 100644
> --- a/hw/vfio/platform.c
> +++ b/hw/vfio/platform.c
> @@ -346,8 +346,7 @@ static int vfio_populate_device(VFIODevice *vbasedev)
>          return ret;
>      }
>  
> -    vdev->regions = g_malloc0_n(vbasedev->num_regions,
> -                                sizeof(VFIORegion *));
> +    vdev->regions = g_malloc0(vbasedev->num_regions * sizeof(VFIORegion *));
>  
>      for (i = 0; i < vbasedev->num_regions; i++) {
>          struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };

Please use g_new0(VFIORegion, vbasedev->num_regions) for extra
compile-time checking and integer overflow protection.  See commits
58889fe net: Use g_new() & friends where that makes obvious sense
3c55fe2 scsi: Use g_new() & friends where that makes obvious sense
ab3ad07 x86: Use g_new() & friends where that makes obvious sense
3ba235a block: Use g_new0() for a bit of extra type checking
e1cf558 util: Use g_new() & friends where that makes obvious sense
02c4f26 block: Use g_new() & friends to avoid multiplying sizes
5839e53 block: Use g_new() & friends where that makes obvious sense