[PATCH] qemuSnapshotDeleteValidate: Fix crash when disk is not found in VM definition

qemuDomainDiskByName() can return a NULL pointer on failure. But this returned value in qemuSnapshotDeleteValidate is not checked.It will make libvirtd crash. Signed-off-by: kaihuan <jungleman759(a)gmail.com&gt; --- src/qemu/qemu_snapshot.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c index 18b2e478f6..bcbd913073 100644 --- a/src/qemu/qemu_snapshot.c +++ b/src/qemu/qemu_snapshot.c @@ -4242,8 +4242,19 @@ qemuSnapshotDeleteValidate(virDomainObj *vm, virDomainDiskDef *vmdisk = NULL; virDomainDiskDef *disk = NULL; - vmdisk = qemuDomainDiskByName(vm->def, snapDisk->name); - disk = qemuDomainDiskByName(snapdef->parent.dom, snapDisk->name); + if (!(vmdisk = qemuDomainDiskByName(vm->def, snapDisk->name))) { + virReportError(VIR_ERR_OPERATION_FAILED, + _("disk '%1$s' referenced by snapshot '%2$s' not found in the current definition"), + snapDisk->name, snap->def->name); + return -1; + } + + if (!(disk = qemuDomainDiskByName(snapdef->parent.dom, snapDisk->name))) { + virReportError(VIR_ERR_OPERATION_FAILED, + _("disk '%1$s' referenced by snapshot '%2$s' not found in the VM definition of the deleted snapshot"), + snapDisk->name, snap->def->name); + return -1; + } if (!virStorageSourceIsSameLocation(vmdisk->src, disk->src)) { virReportError(VIR_ERR_OPERATION_UNSUPPORTED, -- 2.33.1.windows.1