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From: | Philippe Mathieu-Daudé |
Subject: | Re: [PATCH v2 14/14] qga: Fix qmp_guest_suspend_{disk, ram}() error handling |
Date: | Wed, 22 Apr 2020 18:07:04 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 |
On 4/22/20 5:17 PM, Markus Armbruster wrote:
Philippe Mathieu-Daudé <address@hidden> writes:On 4/22/20 3:07 PM, Markus Armbruster wrote: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: aa59637ea1c6a4c83430933f9c44c43e6c3f1b69 Fixes: f54603b6aa765514b2519e74114a2f417759d727 Cc: Michael Roth <address@hidden> Signed-off-by: Markus Armbruster <address@hidden> --- qga/commands-win32.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/qga/commands-win32.c b/qga/commands-win32.c index 9717a8d52d..5ba56327dd 100644 --- a/qga/commands-win32.c +++ b/qga/commands-win32.c @@ -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) {https://www.mail-archive.com/address@hidden/msg695647.html is slightly different by removing the if() check.It frees @mode unconditionally (marked --> below) I believe that's wrong. execute_async() runs do_suspend() in a new thread, and passes it @mode. do_suspend() frees it.
Oops I missed that, good catch! Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
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);diff --git a/qga/commands-win32.c b/qga/commands-win32.c index b49920e201..8b66098056 100644 --- a/qga/commands-win32.c +++ b/qga/commands-win32.c @@ -1341,13 +1341,18 @@ 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); - if (local_err) { - error_propagate(errp, local_err); - g_free(mode); - } +out: + error_propagate(errp, local_err); -->+ g_free(mode); } void qmp_guest_suspend_ram(Error **errp)
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