[libvirt] [PATCH] win32: Properly handle TlsGetValue returning NULL

[Eric Blake]

On 04/21/2012 11:11 AM, Matthias Bolte wrote:
> virThreadSelf tries to access the virThreadPtr stored in TLS for the
> current thread via TlsGetValue. When virThreadSelf is called on a thread
> that was not created via virThreadCreate (e.g. the main thread) then
> TlsGetValue returns NULL as TlsAlloc initializes TLS slots to NULL.
> 
> virThreadSelf can be called on the main thread via this call chain from
> virsh
> 
> vshDeinit
> virEventAddTimeout
> virEventPollAddTimeout
> virEventPollInterruptLocked
> virThreadIsSelf
> 
> triggering a segfault as virThreadSelf unconditionally dereferences the
> return value of TlsGetValue.
> 
> Fix this by making virThreadSelf check the TLS slot value for NULL and
> setting the given virThreadPtr accordingly.
> 
> Reported by Marcel Müller.
> ---
>  src/util/threads-win32.c |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)

ACK.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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