[Qemu-devel] [PATCH 01/14] block: Don't call update_flags_from_options() if the options are wrong

[Alberto Garcia]

If qemu_opts_absorb_qdict() fails and we carry on and call
update_flags_from_options() then that can result on a failed
assertion:

   $ qemu-io -c 'reopen -o read-only=foo' hd.qcow2
   block.c:1101: update_flags_from_options: Assertion `qemu_opt_find(opts, 
BDRV_OPT_CACHE_DIRECT)' failed.
   Aborted

This only happens in bdrv_reopen_queue_child(). Although this function
doesn't return errors, we can simply keep the wrong options in the
reopen queue and later bdrv_reopen_prepare() will fail.

Signed-off-by: Alberto Garcia <be...@igalia.com>
---
 block.c                    | 11 +++++++++--
 tests/qemu-iotests/133     |  6 ++++++
 tests/qemu-iotests/133.out |  4 ++++
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index 57cc4161a2..d79b6cdc73 100644
--- a/block.c
+++ b/block.c
@@ -2950,12 +2950,19 @@ static BlockReopenQueue 
*bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
     if (parent_options) {
         QemuOpts *opts;
         QDict *options_copy;
+        Error *local_err = NULL;
         assert(!flags);
         role->inherit_options(&flags, options, parent_flags, parent_options);
         options_copy = qdict_clone_shallow(options);
         opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort);
-        qemu_opts_absorb_qdict(opts, options_copy, NULL);
-        update_flags_from_options(&flags, opts);
+        qemu_opts_absorb_qdict(opts, options_copy, &local_err);
+        /* Don't call update_flags_from_options() if the options are wrong.
+         * bdrv_reopen_prepare() will later return an error. */
+        if (!local_err) {
+            update_flags_from_options(&flags, opts);
+        } else {
+            error_free(local_err);
+        }
         qemu_opts_del(opts);
         qobject_unref(options_copy);
     }
diff --git a/tests/qemu-iotests/133 b/tests/qemu-iotests/133
index af6b3e1dd4..b9f17c996f 100755
--- a/tests/qemu-iotests/133
+++ b/tests/qemu-iotests/133
@@ -92,6 +92,12 @@ echo
 IMGOPTSSYNTAX=false $QEMU_IO -f null-co -c 'reopen' -c 'info' \
     "json:{'driver': 'null-co', 'size': 65536}"
 
+echo
+echo "=== Check that invalid options are handled correctly ==="
+echo
+
+$QEMU_IO -c 'reopen -o read-only=foo' $TEST_IMG
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/133.out b/tests/qemu-iotests/133.out
index f4a85aeb63..570f623b6b 100644
--- a/tests/qemu-iotests/133.out
+++ b/tests/qemu-iotests/133.out
@@ -24,4 +24,8 @@ Cannot change the option 'driver'
 
 format name: null-co
 format name: null-co
+
+=== Check that invalid options are handled correctly ===
+
+Parameter 'read-only' expects 'on' or 'off'
 *** done
-- 
2.11.0