[libvirt] [PATCH] remote: avoid null dereference on error

[Daniel P. Berrange]

On Tue, May 03, 2011 at 11:28:30AM -0600, Eric Blake wrote:
> Clang found three instances of uninitialized use of nparams in
> the cleanup path.  Unfortunately, one is a false positive: clang
> couldn't see that ret->params.params_val is guaranteed to be
> NULL unless allocated within a function, and that nparams is
> guaranteed to be assigned prior to the allocation; hoisting the
> assignment to nparams to be earlier in the function shuts up
> that false positive.  But two of the reports also happened to
> highlight a real bug - the error path can dereference NULL.
> 
> * daemon/remote.c (remoteDispatchDomainGetMemoryParameters)
> (remoteDispatchDomainGetBlkioParameters): Don't clear fields if
> array was not allocated.
> (remoteDispatchDomainGetSchedulerParameters): Initialize nparams
> earlier.
> ---
>  daemon/remote.c |   29 ++++++++++++++++-------------
>  1 files changed, 16 insertions(+), 13 deletions(-)

ACK

Daniel
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