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Re: [libvirt] [PATCH 1/9] Fix crash when aborting a stream from a I/O callback

On 06/28/2011 11:01 AM, Daniel P. Berrange wrote:
> If a callback being invoked from a stream issues a virStreamAbort
> operation, the stream data will be free'd but the callback will
> then stil try to use this. Delay free'ing of the stream data when


> a callback is dispatching
> * src/fdstream.c: Delay stream free when callback is active
> ---
>  src/fdstream.c |   33 +++++++++++++++++++++++----------
>  1 files changed, 23 insertions(+), 10 deletions(-)

>      cb(stream, events, cbopaque);
>      virMutexLock(&fdst->lock);
> -    fdst->dispatching = 0;
> +    fdst->dispatching = false;
>      if (fdst->cbRemoved && ff)
>          (ff)(cbopaque);

cb is called without locks, while ff is still under the lock.  No change
from previous status quo, but I wonder if ff should ever be moved
outside the lock.


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

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