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qmp: Don't let malformed in-band commands jump the queue

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handle_qmp_command() reports certain errors right away.  This is wrong
when OOB is enabled, because the errors can "jump the queue" then, as
the previous commit demonstrates.

To fix, we need to delay errors until dispatch.  Do that for semantic
errors, mostly by reverting ill-advised parts of commit cf869d5317
"qmp: support out-of-band (oob) execution".  Bonus: doesn't run
qmp_dispatch_check_obj() twice, once in handle_qmp_command(), and
again in do_qmp_dispatch().  That's also due to commit cf869d5317.

The next commit will fix queue jumping for syntax errors.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180703085358.13941-18-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2018-07-03 10:53:43 +02:00
parent e8f4a22168
commit 69240fe62d
4 changed files with 30 additions and 67 deletions
Download patch file Download diff file Expand all files Collapse all files

12
qapi/qmp-dispatch.c
View file

@ -20,8 +20,8 @@
#include "qapi/qmp/qbool.h"
#include "sysemu/sysemu.h"
QDict *qmp_dispatch_check_obj(const QObject *request, bool allow_oob,
Error **errp)
static QDict *qmp_dispatch_check_obj(const QObject *request, bool allow_oob,
Error **errp)
{
const char *exec_key = NULL;
const QDictEntry *ent;
@ -78,6 +78,7 @@ static QObject *do_qmp_dispatch(QmpCommandList *cmds, QObject *request,
bool allow_oob, Error **errp)
{
Error *local_err = NULL;
bool oob;
const char *command;
QDict *args, *dict;
QmpCommand *cmd;
@ -89,9 +90,11 @@ static QObject *do_qmp_dispatch(QmpCommandList *cmds, QObject *request,
}
command = qdict_get_try_str(dict, "execute");
oob = false;
if (!command) {
assert(allow_oob);
command = qdict_get_str(dict, "exec-oob");
oob = true;
}
cmd = qmp_find_command(cmds, command);
if (cmd == NULL) {
@ -104,6 +107,11 @@ static QObject *do_qmp_dispatch(QmpCommandList *cmds, QObject *request,
command);
return NULL;
}
if (oob && !(cmd->options & QCO_ALLOW_OOB)) {
error_setg(errp, "The command %s does not support OOB",
command);
return false;
}
if (runstate_check(RUN_STATE_PRECONFIG) &&
!(cmd->options & QCO_ALLOW_PRECONFIG)) {