On Mon, Jul 30, 2018 at 09:48:51AM +0100, Daniel P. Berrangé wrote:
On Mon, Jul 30, 2018 at 10:25:05AM +0200, Michal Privoznik wrote:
One of the attributes that original virCgroupFree() had was it set passed pointer to NULL. For instance in the following code the latter call would be practically a no-op:
virCgroupFree(&var); virCgroupFree(&var);
However, this behaviour of the function was changed in 0f80c71822d824 but corresponding 'var = NULL' lines were not added leading to double free:
Sigh, can we please just revert that change. It is going in completely the oppposite of what we should be doing. We want to change more functions to take a ptr to a ptr, precisely because it avoids this double-free problem.
Even more crazy, this change was done so that VIR_DEFINE_AUTOPTR_FUNC() could be used to define a free function which takes a ptr to a ptr. Both of these changes should be reverted, as the previously existing virCgroupFree should be used as the attribute((cleanup)) function directly with no wrapper created. Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|