Re: [Qemu-devel] [PATCH 2/2] block/qapi: fix unbounded stack for dump_qdict

[Eric Blake]

On 03/08/2016 10:56 PM, Peter Xu wrote:
> Using heap instead of stack for better safety.
> 
> Signed-off-by: Peter Xu <address@hidden>
> ---
>  block/qapi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

> 
> diff --git a/block/qapi.c b/block/qapi.c
> index c4c2115..b798e35 100644
> --- a/block/qapi.c
> +++ b/block/qapi.c
> @@ -636,9 +636,8 @@ static void dump_qdict(fprintf_function func_fprintf, 
> void *f, int indentation,
>      for (entry = qdict_first(dict); entry; entry = qdict_next(dict, entry)) {
>          QType type = qobject_type(entry->value);
>          bool composite = (type == QTYPE_QDICT || type == QTYPE_QLIST);
> -        char key[strlen(entry->key) + 1];
> +        char *key = g_malloc(strlen(entry->key) + 1);
>          int i;
> -
>          /* replace dashes with spaces in key (variable) names */
>          for (i = 0; entry->key[i]; i++) {
>              key[i] = entry->key[i] == '-' ? ' ' : entry->key[i];
> @@ -650,6 +649,7 @@ static void dump_qdict(fprintf_function func_fprintf, 
> void *f, int indentation,
>          if (!composite) {
>              func_fprintf(f, "\n");
>          }
> +        g_free(key);
>      }
>  }
>  
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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