Re: [libvirt] [PATCH 5/5] leasehelper: Refactor copying of old entries to avoid double free

When copying entries from the old lease file into the new array the old code would copy the pointer of the json object into the second array without removing it from the first. Afterwards when both arrays were freed this might lead to a crash due to access of already freed memory. Refactor the code to use the new array item stealing helper added to the json code so that the entry resides just in one array. --- src/network/leaseshelper.c | 79 +++++++++++++++++++++++++--------------------- 1 file changed, 43 insertions(+), 36 deletions(-)

- /* Check whether lease has to be included or not */ - if (delete && STREQ(ip_tmp, ip)) - continue; + /* Move old lease to new array */ + lease_tmp = virJSONValueArraySteal(leases_array, i);

- /* Add old lease to new array */ - if (virJSONValueArrayAppend(leases_array_new, lease_tmp) < 0) { - virReportError(VIR_ERR_INTERNAL_ERROR, "%s", - _("failed to create json")); - goto cleanup; + if (virJSONValueArrayAppend(leases_array_new, lease_tmp) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to create json")); + goto cleanup; + } + } } }