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qmemman: make memory request handling more defensive

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If getting memory for new VM fails for any reason, make sure that global
lock will be released. Otherwise qmemman will stop functioning at all.

QubesOS/qubes-issues#1636
This commit is contained in:
Marek Marczykowski-Górecki 2016-02-22 17:56:43 +01:00
parent 5546d679c0
commit 0121cb2fd4
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GPG Key ID: 063938BA42CFA724
1 changed files with 32 additions and 28 deletions
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12
qmemman/qmemman_server.py
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@ -175,6 +175,7 @@ class QMemmanReqHandler(SocketServer.BaseRequestHandler):
self.log = logging.getLogger('qmemman.daemon.reqhandler')
got_lock = False
try:
# self.request is the TCP socket connected to the client
while True:
self.data = self.request.recv(1024).strip()
@ -184,8 +185,6 @@ class QMemmanReqHandler(SocketServer.BaseRequestHandler):
if got_lock:
global force_refresh_domain_list
force_refresh_domain_list = True
global_lock.release()
self.log.debug('global_lock released')
return
# XXX something is wrong here: return without release?
@ -204,8 +203,13 @@ class QMemmanReqHandler(SocketServer.BaseRequestHandler):
resp = "FAIL\n"
self.log.debug('resp={!r}'.format(resp))
self.request.send(resp)
# XXX no release of lock?
except BaseException as e:
self.log.exception(
"exception while handling request: {!r}".format(e))
finally:
if got_lock:
global_lock.release()
self.log.debug('global_lock released')
def start_server(server):