block: Don't call update_flags_from_options() if the options are wrong

PATCH Superseded Alberto Garcia 1 participant 1 message Sep 11, 2018

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Alberto Garcia

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2018-09-11 12:39 UTC #0 lore raw

PATCH 1/1 block: Don't call update_flags_from_options() if the options are wrong

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 <[email protected]>

---
 block.c                    | 11 +++++++++--
 tests/qemu-iotests/133     |  6 ++++++
 tests/qemu-iotests/133.out |  4 ++++
 3 files changed, 19 insertions(+), 2 deletions(-)

block.c +9 -2

index 0dbb1fcc7b..739d9073a6 100644
@@ -2931,12 +2931,19 @@ 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);
     }

tests/qemu-iotests/133 +6 -0

index af6b3e1dd4..b9f17c996f 100755
@@ -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

tests/qemu-iotests/133.out +4 -0

index f4a85aeb63..570f623b6b 100644
@@ -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

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2.11.0