'virDomainObjPrivateJobCallbacks' is passed into the job object by copying a pointer from the 'virDomainXMLOption' struct passed in from the caller. Unfortunately the 'virdomainjob' module can't control the lifetime of the virDomainXMLOption, which in some cases is freed before the domain job data. To avoid dereferencing freed memory create a copy of the struct holding the private job callbacks. Fixes: 84e9fd068ccad6e19e037cd6680df437617e2de5 Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx> --- This is a naive attempt to fix a crash reported on the upstream mailing list https://listman.redhat.com/archives/libvir-list/2022-September/234310.html Note that I didn't analyze the code in that series in detail, I just debugged the visible misbehaviour. CI pipeline now passes even on OpenSUSE: https://gitlab.com/pipo.sk/libvirt/-/pipelines/643828256 src/conf/virdomainjob.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/src/conf/virdomainjob.c b/src/conf/virdomainjob.c index 7915faa125..16fb0c2177 100644 --- a/src/conf/virdomainjob.c +++ b/src/conf/virdomainjob.c @@ -122,13 +122,25 @@ virDomainJobStatusToType(virDomainJobStatus status) return VIR_DOMAIN_JOB_NONE; } + +static virDomainObjPrivateJobCallbacks * +virDomainObjPrivateJobCallbacksCopy(virDomainObjPrivateJobCallbacks *cb) +{ + virDomainObjPrivateJobCallbacks *ret = g_new0(virDomainObjPrivateJobCallbacks, 1); + + memcpy(ret, cb, sizeof(virDomainObjPrivateJobCallbacks)); + + return ret; +} + + int virDomainObjInitJob(virDomainJobObj *job, virDomainObjPrivateJobCallbacks *cb, virDomainJobDataPrivateDataCallbacks *jobDataPrivateCb) { memset(job, 0, sizeof(*job)); - job->cb = cb; + job->cb = virDomainObjPrivateJobCallbacksCopy(cb); job->jobDataPrivateCb = jobDataPrivateCb; if (virCondInit(&job->cond) < 0) @@ -229,6 +241,8 @@ virDomainObjClearJob(virDomainJobObj *job) if (job->cb && job->cb->freeJobPrivate) g_clear_pointer(&job->privateData, job->cb->freeJobPrivate); + + g_clear_pointer(&job->cb, g_free); } void -- 2.37.1
