[libvirt] [PATCH v2] util: Forbid calling hash APIs from iterator callback

[Eric Blake]

On 03/17/2011 09:22 AM, Jiri Denemark wrote:
> Calling most hash APIs is not safe from inside of an iterator callback.
> Exceptions are APIs that do not modify the hash table and removing
> current hash entry from virHashFroEach callback.
> 
> This patch make all APIs which are not safe fail instead of just relying
> on the callback being nice not calling any unsafe APIs.
> ---
>  src/util/hash.c |   49 +++++++++++++++++++++++++++++++++++++++++++++----
>  1 files changed, 45 insertions(+), 4 deletions(-)
> 
> diff --git a/src/util/hash.c b/src/util/hash.c
> index 2a9a9cf..48a94ad 100644
> --- a/src/util/hash.c
> +++ b/src/util/hash.c
> @@ -35,6 +35,12 @@
>  
>  /* #define DEBUG_GROW */
>  
> +#define virHashIterationError(ret)                                      \
> +    do {                                                                \
> +        VIR_ERROR0(_("Hash operation not allowed during iteration"));   \
> +        return ret;                                                     \
> +    } while (0)

ACK; nice helper macro.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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