Re: [Xen-devel] [PATCH 22/22] libxc: check blob size before proceeding in xc_dom_check_gzip

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 11/06/13 19:21, Ian Jackson wrote:
> From: Matthew Daley <mattjd@xxxxxxxxx>
>
> This is part of the fix to a security issue, XSA-55.
>
> Signed-off-by: Matthew Daley <mattjd@xxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

>
> v6: This patch is new in v6 of the series.
> ---
>  tools/libxc/xc_dom_core.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/tools/libxc/xc_dom_core.c b/tools/libxc/xc_dom_core.c
> index 1a14d3c..bf05d2a 100644
> --- a/tools/libxc/xc_dom_core.c
> +++ b/tools/libxc/xc_dom_core.c
> @@ -284,6 +284,10 @@ size_t xc_dom_check_gzip(xc_interface *xch, void *blob, 
> size_t ziplen)
>      unsigned char *gzlen;
>      size_t unziplen;
>  
> +    if ( ziplen < 6 )
> +        /* too small */
> +        return 0;
> +
>      if ( strncmp(blob, "\037\213", 2) )
>          /* not gzipped */
>          return 0;


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