[libvirt] [PATCH] qemu: Fix crash when updating media with shared device

Mimic the fix done in 02b9097274d1330c2e1dca7f598880e09b5c2aa0 to fix crash by accessing an already freed structure. Also copy the explaining comment why the pointer can't be accessed any more. --- src/qemu/qemu_driver.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 96bf235..552a81b 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -6073,14 +6073,17 @@ qemuDomainChangeDiskMediaLive(virDomainObjPtr vm, goto end; ret = qemuDomainChangeEjectableMedia(driver, vm, disk, orig_disk, force); + /* 'disk' must not be accessed now - it has been freed. + * 'orig_disk' now points to the new disk, while 'dev_copy' + * now points to the old disk */ + + /* Need to remove the shared disk entry for the original + * disk src if the operation is either ejecting or updating. + */ if (ret == 0) { dev->data.disk = NULL; - /* Need to remove the shared disk entry for the original - * disk src if the operation is either ejecting or updating. - */ - if (orig_disk->src && STRNEQ_NULLABLE(orig_disk->src, disk->src)) - ignore_value(qemuRemoveSharedDisk(driver, dev_copy->data.disk, - vm->def->name)); + ignore_value(qemuRemoveSharedDisk(driver, dev_copy->data.disk, + vm->def->name)); } break; default: -- 1.8.1.5