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Eric Blake 9b4e38fe6a qapi: Fix crash on missing alternate member of QAPI struct 
If a QAPI struct has a mandatory alternate member which is not
present on input, the input visitor reports an error for the
missing alternate without setting the discriminator, but the
cleanup code for the struct still tries to use the dealloc
visitor to clean up the alternate.

Commit dbf11922 changed visit_start_alternate to set *obj to NULL
when an error occurs, where it was previously left untouched.
Thus, before the patch, the dealloc visitor is blindly trying to
cleanup whatever branch corresponds to (*obj)->type == 0 (that is,
QTYPE_NONE, because *obj still pointed to zeroed memory), which
selects the default branch of the switch and sets an error, but
this second error is ignored by the way the dealloc visitor is
used; but after the patch, the attempt to switch dereferences NULL.

When cleaning up after a partial object parse, we specifically
check for !*obj after visit_start_struct() (see gen_visit_object());
doing the same for alternates fixes the crash. Enhance the testsuite
to give coverage for both missing struct and missing alternate
members.

Also add an abort - we expect visit_start_alternate() to either set an
error or to set (*obj)->type to a valid QType that corresponds to
actual user input, and QTYPE_NONE should never be reachable from valid
input.  Had the abort() been in place earlier, we might have noticed
the dealloc visitor dereferencing bogus zeroed memory prior to when
commit dbf11922 forced our hand by setting *obj to NULL and causing a
fault.

Test case:

{'execute':'blockdev-add', 'arguments':{'options':{'driver':'raw'}}}

The choice of 'driver':'raw' selects a BlockdevOptionsGenericFormat
struct, which has a mandatory 'file':'BlockdevRef' in QAPI.  Since
'file' is missing as a sibling of 'driver', this should report a
graceful error rather than fault.  After this patch, we are back to:

{"error": {"class": "GenericError", "desc": "Parameter 'file' is missing"}}

Generated code in qapi-visit.c changes as:

|@@ -2444,6 +2444,9 @@ void visit_type_BlockdevRef(Visitor *v,
|     if (err) {
|         goto out;
|     }
|+    if (!*obj) {
|+        goto out_obj;
|+    }
|     switch ((*obj)->type) {
|     case QTYPE_QDICT:
|         visit_start_struct(v, name, NULL, 0, &err);
|@@ -2459,10 +2462,13 @@ void visit_type_BlockdevRef(Visitor *v,
|     case QTYPE_QSTRING:
|         visit_type_str(v, name, &(*obj)->u.reference, &err);
|         break;
|+    case QTYPE_NONE:
|+        abort();
|     default:
|         error_setg(&err, QERR_INVALID_PARAMETER_TYPE, name ? name : "null",
|                    "BlockdevRef");
|     }
|+out_obj:
|     visit_end_alternate(v);

Reported by Kashyap Chamarthy <kchamart@redhat.com>
CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1466012271-5204-1-git-send-email-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Tested-by: Kashyap Chamarthy <kchamart@redhat.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-06-30 15:24:36 +02:00
..
acpi-test-data acpi-test-data: update expected 2016-06-24 08:22:07 +03:00
docker tests/docker: build all targets in test-clang 2016-06-08 15:19:30 +08:00
guest-debug tests/guest-debug: introduce basic gdbstub tests 2015-12-17 13:37:15 +00:00
image-fuzzer tests: Use Python 2.6 "except E as ..." syntax 2016-02-08 17:29:54 +01:00
libqos libqos: add qvirtqueue_cleanup() 2016-06-20 11:44:12 +01:00
multiboot
qapi-schema qapi: Allow anonymous base for flat union 2016-03-18 10:29:26 +01:00
qemu-iotests iotests: add small-granularity mirror test 2016-06-28 22:53:03 -04:00
rocker rocker: tests: don't need to specify master/self when setting vlans 2015-07-07 13:13:22 +01:00
tcg Fix some typos found by codespell 2016-05-18 15:04:27 +03:00
vmstate-static-checker-data
.gitignore qht: add test-qht-par to invoke qht-bench from 'check' target 2016-06-11 17:11:16 -07:00
ac97-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ahci-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
bios-tables-test.c bios: Add tests for the IPMI ACPI and SMBIOS entries 2016-06-24 05:13:57 +03:00
boot-order-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
boot-sector.c all: Clean up includes 2016-02-23 12:43:05 +00:00
boot-sector.h tests: add pxe e1000 and virtio-pci tests 2016-02-16 12:05:18 +02:00
check-block.sh qemu-iotests: make check-block.sh work on out-of-tree builds 2016-01-07 21:30:16 +01:00
check-qdict.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qfloat.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qint.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qjson.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qlist.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qnull.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qom-interface.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qom-proplist.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
check-qstring.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
crypto-tls-x509-helpers.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
crypto-tls-x509-helpers.h crypto: add sanity checking of TLS x509 credentials 2015-09-15 15:05:09 +01:00
device-introspect-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
display-vga-test.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
drive_del-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ds1338-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
e1000-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
e1000e-test.c clean-includes: run it once more 2016-06-16 18:39:03 +02:00
eepro100-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
endianness-test.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
es1370-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
fdc-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
fw_cfg-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
hd-geo-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
i440fx-test.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
i82801b11-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ide-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
intel-hda-test.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
io-channel-helpers.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
io-channel-helpers.h io: add QIOChannelSocket class 2015-12-18 12:18:31 +00:00
ioh3420-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ipmi-bt-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ipmi-kcs-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ipoctal232-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
ivshmem-test.c os-posix: include sys/mman.h 2016-06-16 18:39:03 +02:00
libqtest.c tests: fix libqtest socket timeouts 2016-06-16 09:50:07 +05:30
libqtest.h all: Clean up includes 2016-02-23 12:43:05 +00:00
m48t59-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
Makefile.include arm: Re-enable tmp105 test 2016-06-27 15:37:32 +01:00
ne2000-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
nvme-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
pc-cpu-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
pcnet-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
pkix_asn1_tab.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
postcopy-test.c clean-includes: run it once more 2016-06-16 18:39:03 +02:00
prom-env-test.c ppc / sparc: Add a tester for checking whether OpenBIOS runs successfully 2016-06-17 15:57:59 +10:00
pvpanic-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
pxe-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
q35-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
qemu-iotests-quick.sh
qht-bench.c clean-includes: run it once more 2016-06-16 18:39:03 +02:00
qom-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
rcutorture.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
rtc-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
rtl8139-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
spapr-phb-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
tco-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-aio.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-base64.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-bitops.c bitops.h: Implement half-shuffle and half-unshuffle ops 2016-06-17 15:23:51 +01:00
test-blockjob-txn.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-coroutine.c trivial patches for 2016-06-07 2016-06-07 16:34:45 +01:00
test-crypto-afsplit.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-crypto-block.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-crypto-cipher.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-crypto-hash.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-crypto-ivgen.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-crypto-pbkdf.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-crypto-secret.c crypto: remove temp files on completion of secrets test 2016-06-13 12:41:17 +01:00
test-crypto-tlscredsx509.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-crypto-tlssession.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-crypto-xts.c crypto: import an implementation of the XTS cipher mode 2016-03-17 14:41:15 +00:00
test-cutils.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-filter-mirror.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-filter-redirector.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
test-hbitmap.c hbitmap: Use DIV_ROUND_UP 2016-06-07 18:19:25 +03:00
test-int128.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-io-channel-buffer.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-io-channel-command.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-io-channel-file.c include/qemu/osdep.h: Don't include qapi/error.h 2016-03-22 22:20:15 +01:00
test-io-channel-socket.c socket: unlink unix socket on remove 2016-06-29 16:49:41 +02:00
test-io-channel-tls.c tests: Clean up includes 2016-02-16 14:29:27 +00:00
test-io-task.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-iov.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-logging.c log: Fix qemu_set_log_filename() error handling 2016-06-20 16:39:08 +02:00
test-mul64.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-netfilter.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-opts-visitor.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-qdev-global-props.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-qdist.c clean-includes: run it once more 2016-06-16 18:39:03 +02:00
test-qemu-opts.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-qga.c tests: start a /qga/guest-exec test 2016-06-07 11:25:06 -05:00
test-qht-par.c clean-includes: run it once more 2016-06-16 18:39:03 +02:00
test-qht.c clean-includes: run it once more 2016-06-16 18:39:03 +02:00
test-qmp-commands.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-qmp-event.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-qmp-input-strict.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-qmp-input-visitor.c qapi: Fix crash on missing alternate member of QAPI struct 2016-06-30 15:24:36 +02:00
test-qmp-output-visitor.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-rcu-list.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-rfifolock.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-string-input-visitor.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-string-output-visitor.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-thread-pool.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-throttle.c trivial patches for 2016-06-07 2016-06-07 16:34:45 +01:00
test-timed-average.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-visitor-serialization.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-vmstate.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-write-threshold.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-x86-cpuid.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
test-xbzrle.c util: move declarations out of qemu-common.h 2016-03-22 22:20:17 +01:00
tmp105-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
tpci200-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
usb-hcd-ehci-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
usb-hcd-ohci-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
usb-hcd-uhci-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
usb-hcd-xhci-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
vhost-user-bridge.c pc, pci, virtio: new features, cleanups, fixes 2016-06-17 11:25:46 +01:00
vhost-user-test.c vhost-user-test: fix g_cond_wait_until compat implementation 2016-06-29 16:49:40 +02:00
virtio-9p-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
virtio-balloon-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
virtio-blk-test.c Error reporting patches for 2016-06-20 2016-06-20 16:19:18 +01:00
virtio-console-test.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00
virtio-net-test.c Error reporting patches for 2016-06-20 2016-06-20 16:19:18 +01:00
virtio-rng-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
virtio-scsi-test.c Error reporting patches for 2016-06-20 2016-06-20 16:19:18 +01:00
virtio-serial-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
vmxnet3-test.c tests: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
wdt_ib700-test.c coccinelle: Remove unnecessary variables for function return value 2016-06-20 16:38:13 +02:00