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qga: Fix qmp_guest_suspend_{disk, ram}() error handling 

The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second

qmp_guest_suspend_disk() and qmp_guest_suspend_ram() pass @local_err
first to check_suspend_mode(), then to acquire_privilege(), then to
execute_async().  Continuing after errors here can only end in tears.
For instance, we risk tripping error_setv()'s assertion.

Fixes: aa59637ea1
Fixes: f54603b6aa
Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200422130719.28225-15-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Markus Armbruster 2020-04-22 15:07:19 +02:00
parent 4155c998b6
commit 51bd458166
1 changed files with 14 additions and 0 deletions
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14
qga/commands-win32.c
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@ -1322,9 +1322,16 @@ void qmp_guest_suspend_disk(Error **errp)
*mode = GUEST_SUSPEND_MODE_DISK;
check_suspend_mode(*mode, &local_err);
if (local_err) {
goto out;
}
acquire_privilege(SE_SHUTDOWN_NAME, &local_err);
if (local_err) {
goto out;
}
execute_async(do_suspend, mode, &local_err);
out:
if (local_err) {
error_propagate(errp, local_err);
g_free(mode);
@ -1338,9 +1345,16 @@ void qmp_guest_suspend_ram(Error **errp)
*mode = GUEST_SUSPEND_MODE_RAM;
check_suspend_mode(*mode, &local_err);
if (local_err) {
goto out;
}
acquire_privilege(SE_SHUTDOWN_NAME, &local_err);
if (local_err) {
goto out;
}
execute_async(do_suspend, mode, &local_err);
out:
if (local_err) {
error_propagate(errp, local_err);
g_free(mode);