Re: [PATCH] libxl: Check for regcomp failure

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

On 04.09.2013 08:37, Jim Fehlig wrote:
> Change libxlGetAutoballoonConf() function to return an int
> for success/failure, and fail if regcomp fails.
> 
> Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
> ---
>  src/libxl/libxl_conf.c | 30 +++++++++++++++++++-----------
>  1 file changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index fcb278b..a634476 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -1014,21 +1014,28 @@ error:
>      return -1;
>  }
>  
> -static bool
> -libxlGetAutoballoonConf(libxlDriverConfigPtr cfg)
> +static int
> +libxlGetAutoballoonConf(libxlDriverConfigPtr cfg, bool *autoballoon)
>  {
>      regex_t regex;
> -    int ret;
> +    int res;
> +
> +    if ((res = regcomp(&regex,
> +                      "(^| )dom0_mem=((|min:|max:)[0-9]+[bBkKmMgG]?,?)+($| )",
> +                       REG_NOSUB | REG_EXTENDED)) != 0) {
> +        char error[100];
> +        regerror(res, &regex, error, sizeof(error));
> +        virReportError(VIR_ERR_INTERNAL_ERROR,
> +                       _("Failed to compile regex %s"),
> +                       error);

My only concern is, that 100 bytes may not be enough sometimes. But on
the other hand, there's another occurrence of regerror and there's
buffer of the exact size passed too. So I'm comfortable enough to give
you my ACK.

Michal

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