Re: [libvirt] [PREPOST 05/17] src/xenxs:Refactor PCI parsing code
On 07/11/2014 11:09 AM, Jim Fehlig wrote:
David Kiarie wrote:
> +
> + /* pci=['0000:00:1b.0','0000:00:13.0'] */
> + if (!(key = list->str))
> + goto skippci;
> + if (!(nextkey = strchr(key, ':')))
> + goto skippci;
> +
> + if (virStrncpy(domain, key, (nextkey - key), sizeof(domain)) == NULL) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("Domain %s too big for destination"),
key);
>
Pre-existing, but while we are touching the code, I wonder if the use of
virReportError here is correct? The device is skipped if there is a
problem parsing it. I think these errors should be logged via VIR_WARN,
but would like confirmation from another libvirt dev before asking you
to change them. At the very least, the error should be changed to
VIR_ERR_CONF_SYNTAX.
How easy is it to trigger this error path via user input? If the string
that we are splitting is normally provided from a sane source, using
VIR_ERR_INTERNAL_ERROR is okay; if the string we are splitting can come
from a user that can easily try to fuzz things to confuse us, then
VIR_ERR_CONF_SYNTAX is indeed nicer.
As for whether to skip a device we can't parse, or outright fail, I'm
not sure which is better. If you are just skipping the device, then
using VIR_WARN instead of virReportError will avoid the odd case of
returning success to the user while still having an error set.
Don't know if I helped or just made it more confusing.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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