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rpc: avoid libvirtd crash on unexpected client close

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Steps to reproduce this problem (vm1 is not running):
for i in `seq 50`; do virsh managedsave vm1& done; killall virsh

Pre-patch, virNetServerClientClose could end up setting client->sock
to NULL prior to other cleanup functions trying to use client->sock.
This fixes things by checking for NULL in more places, and by deferring
the cleanup until after all queued messages have been served.

* src/rpc/virnetserverclient.c (virNetServerClientRegisterEvent)
(virNetServerClientGetFD, virNetServerClientIsSecure)
(virNetServerClientLocalAddrString)
(virNetServerClientRemoteAddrString): Check for closed socket.
(virNetServerClientClose): Rearrange close sequence.
Analysis from Wen Congyang.
This commit is contained in:
Eric Blake 2011-08-01 13:41:38 -06:00
parent 22da8c941c
commit 4e006b844f
1 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/rpc/virnetserverclient.c
View File

@ -177,7 +177,8 @@ static int virNetServerClientRegisterEvent(virNetServerClientPtr client)
client->refs++;
VIR_DEBUG("Registering client event callback %d", mode);
if (virNetSocketAddIOCallback(client->sock,
if (!client->sock ||
virNetSocketAddIOCallback(client->sock,
mode,
virNetServerClientDispatchEvent,
client,
@ -386,9 +387,10 @@ int virNetServerClientGetTLSKeySize(virNetServerClientPtr client)
int virNetServerClientGetFD(virNetServerClientPtr client)
{
int fd = 0;
int fd = -1;
virNetServerClientLock(client);
fd = virNetSocketGetFD(client->sock);
if (client->sock)
fd = virNetSocketGetFD(client->sock);
virNetServerClientUnlock(client);
return fd;
}
@ -396,9 +398,10 @@ int virNetServerClientGetFD(virNetServerClientPtr client)
int virNetServerClientGetLocalIdentity(virNetServerClientPtr client,
uid_t *uid, pid_t *pid)
{
int ret;
int ret = -1;
virNetServerClientLock(client);
ret = virNetSocketGetLocalIdentity(client->sock, uid, pid);
if (client->sock)
ret = virNetSocketGetLocalIdentity(client->sock, uid, pid);
virNetServerClientUnlock(client);
return ret;
}
@ -413,7 +416,7 @@ bool virNetServerClientIsSecure(virNetServerClientPtr client)
if (client->sasl)
secure = true;
#endif
if (virNetSocketIsLocal(client->sock))
if (client->sock && virNetSocketIsLocal(client->sock))
secure = true;
virNetServerClientUnlock(client);
return secure;
@ -502,12 +505,16 @@ void virNetServerClientSetDispatcher(virNetServerClientPtr client,
const char *virNetServerClientLocalAddrString(virNetServerClientPtr client)
{
if (!client->sock)
return NULL;
return virNetSocketLocalAddrString(client->sock);
}
const char *virNetServerClientRemoteAddrString(virNetServerClientPtr client)
{
if (!client->sock)
return NULL;
return virNetSocketRemoteAddrString(client->sock);
}
@ -570,10 +577,7 @@ void virNetServerClientClose(virNetServerClientPtr client)
virNetTLSSessionFree(client->tls);
client->tls = NULL;
}
if (client->sock) {
virNetSocketFree(client->sock);
client->sock = NULL;
}
client->wantClose = true;
while (client->rx) {
virNetMessagePtr msg
@ -586,6 +590,11 @@ void virNetServerClientClose(virNetServerClientPtr client)
virNetMessageFree(msg);
}
if (client->sock) {
virNetSocketFree(client->sock);
client->sock = NULL;
}
virNetServerClientUnlock(client);
}