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security: Don't count RetainPermanent clients twice 

If a RetainPermanent client is subsequently killed by a KillClient
request, the reference count is decremented twice. This can cause the
server to prematurely kill other clients using the same Authorization.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Peter Harris <pharris@opentext.com>
This commit is contained in:
Peter Harris 2013-07-15 19:44:45 -04:00 committed by Adam Jackson
parent 20c2a3bcb1
commit 132507eba9
1 changed files with 8 additions and 3 deletions
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11
Xext/security.c
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@ -57,8 +57,9 @@ static DevPrivateKeyRec stateKeyRec;
/* This is what we store as client security state */
typedef struct {
int haveState;
unsigned int trustLevel;
unsigned int haveState :1;
unsigned int live :1;
unsigned int trustLevel :2;
XID authId;
} SecurityStateRec;
@ -141,6 +142,7 @@ SecurityLabelInitial(void)
state = dixLookupPrivate(&serverClient->devPrivates, stateKey);
state->trustLevel = XSecurityClientTrusted;
state->haveState = TRUE;
state->live = FALSE;
}
/*
@ -953,6 +955,7 @@ SecurityClientState(CallbackListPtr *pcbl, pointer unused, pointer calldata)
state->trustLevel = XSecurityClientTrusted;
state->authId = None;
state->haveState = TRUE;
state->live = FALSE;
break;
case ClientStateRunning:
@ -963,6 +966,7 @@ SecurityClientState(CallbackListPtr *pcbl, pointer unused, pointer calldata)
if (rc == Success) {
/* it is a generated authorization */
pAuth->refcnt++;
state->live = TRUE;
if (pAuth->refcnt == 1 && pAuth->timer)
TimerCancel(pAuth->timer);
@ -975,9 +979,10 @@ SecurityClientState(CallbackListPtr *pcbl, pointer unused, pointer calldata)
rc = dixLookupResourceByType((pointer *) &pAuth, state->authId,
SecurityAuthorizationResType, serverClient,
DixGetAttrAccess);
if (rc == Success) {
if (rc == Success && state->live) {
/* it is a generated authorization */
pAuth->refcnt--;
state->live = FALSE;
if (pAuth->refcnt == 0)
SecurityStartAuthorizationTimer(pAuth);
}