[libvirt] [PATCH] remote: avoid null dereference on error
Daniel P. Berrange
berrange at redhat.com
Wed May 4 16:38:25 UTC 2011
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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