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[Qemu-devel] [PULL 3/4] qmp-commands: fix incorrect uses of ":O" specifi


From: Luiz Capitulino
Subject: [Qemu-devel] [PULL 3/4] qmp-commands: fix incorrect uses of ":O" specifier
Date: Fri, 24 Apr 2015 15:01:17 -0400

From: Paolo Bonzini <address@hidden>

As far as the QMP parser is concerned, neither the 'O' nor the 'q' format 
specifiers
put any constraint on the command.  However, there are two differences:

1) from a documentation point of view 'O' says that this command takes
a dictionary.  The dictionary will be converted to QemuOpts in the
handler to match the corresponding HMP command.

2) 'O' sets QMP_ACCEPT_UNKNOWNS, resulting in the command accepting invalid
extra arguments.  For example the following is accepted:

   { "execute": "send-key",
        "arguments": { "keys": [ { "type": "qcode", "data": "ctrl" },
                                 { "type": "qcode", "data": "alt" },
                                 { "type": "qcode", "data": "delete" } ], 
"foo": "bar" } }

Neither send-key nor migrate-set-capabilities take a QemuOpts-like
dictionary; they take an array of dictionaries.  And neither command
really wants to have extra unknown arguments.  Thus, the right
specifier to use in this case is 'q'; with this patch the above
command fails with

   {"error": {"class": "GenericError", "desc": "Invalid parameter 'foo'"}}

as intended.

Reported-by: Alberto Garcia <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
Reviewed-by: Alberto Garcia <address@hidden>
Signed-off-by: Luiz Capitulino <address@hidden>
---
 qmp-commands.hx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/qmp-commands.hx b/qmp-commands.hx
index 3a42ad0..09f48ba 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -332,7 +332,7 @@ EQMP
 
     {
         .name       = "send-key",
-        .args_type  = "keys:O,hold-time:i?",
+        .args_type  = "keys:q,hold-time:i?",
         .mhandler.cmd_new = qmp_marshal_input_send_key,
     },
 
@@ -3288,7 +3288,7 @@ EQMP
 
     {
         .name       = "migrate-set-capabilities",
-        .args_type  = "capabilities:O",
+        .args_type  = "capabilities:q",
         .params     = "capability:s,state:b",
        .mhandler.cmd_new = qmp_marshal_input_migrate_set_capabilities,
     },
-- 
1.9.3




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