Re: [Xen-devel] [PATCH] [PATCH] libxl: fix bootloader args setting [with diff]

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2012-02-06 at 15:14 +0000, Zhigang Wang wrote:
> # HG changeset patch
> # User Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>
> # Date 1328541193 18000
> # Node ID 72f1296a55a470426e1c3e5b8b2ba907ab6eb78c
> # Parent  3432abcf9380d3840ca38439a304f74a37d155fc
> libxl: fix bootloader args setting
> 
> When bootloader_args = ['foo', 'bar'], then info->u.pv.bootloader_args =
> 
>     foo\0
>     bar\0
>     \0
> 
> Before this patch, 'p++' points to the next character of 'foo\0' and never
> comes to 'bar\0' (because of the '\0' in 'foo\0'), so the args will be:
> 
>     args[0] = 'oo\0'
>     args[1] = 'o\0'
> 
> After this patch, 'p++' points to the next string of pv.bootloader_args, so we
> get the correct args:
> 
>     args[0] = 'foo\0'
>     args[1] = 'bar\0'
> 
> Signed-off-by: Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

> diff -r 3432abcf9380 -r 72f1296a55a4 tools/libxl/libxl_bootloader.c
> --- a/tools/libxl/libxl_bootloader.c  Thu Feb 02 15:47:26 2012 +0000
> +++ b/tools/libxl/libxl_bootloader.c  Mon Feb 06 10:13:13 2012 -0500
> @@ -49,9 +49,11 @@ static char **make_bootloader_args(libxl
>      flexarray_set(args, nr++, libxl__sprintf(gc, "--output-directory=%s", 
> "/var/run/libxl/"));
>  
>      if (info->u.pv.bootloader_args) {
> -        char *p = info->u.pv.bootloader_args[0];
> -        while (*(p++))
> -            flexarray_set(args, nr++, p);
> +        char **p = info->u.pv.bootloader_args;
> +        while (*p) {
> +            flexarray_set(args, nr++, *p);
> +            p++;
> +        }
>      }
>  
>      flexarray_set(args, nr++, disk);
> 
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