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winspool: AddMonitor: Test the driver entry before return an error.

This commit is contained in:
Detlef Riekenberg 2006-06-16 10:01:31 +02:00 committed by Alexandre Julliard
parent 685e7007e1
commit 698a8a0b86
1 changed files with 16 additions and 3 deletions
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17
dlls/winspool.drv/info.c
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@ -1481,9 +1481,22 @@ BOOL WINAPI AddMonitorW(LPWSTR pName, DWORD Level, LPBYTE pMonitors)
}
if(RegCreateKeyExW( hroot, mi2w->pName, 0, NULL, REG_OPTION_NON_VOLATILE,
KEY_WRITE, NULL, &hentry, &disposition) == ERROR_SUCCESS) {
KEY_WRITE | KEY_QUERY_VALUE, NULL, &hentry,
&disposition) == ERROR_SUCCESS) {
if (disposition == REG_OPENED_EXISTING_KEY) {
/* Some installers set options for the port before calling AddMonitor.
We query the "Driver" entry to verify that the monitor is installed,
before we return an error.
When a user installs two print monitors at the same time with the
same name but with a different driver DLL and a task switch comes
between RegQueryValueExW and RegSetValueExW, a race condition
is possible but silently ignored. */
DWORD namesize = 0;
if ((disposition == REG_OPENED_EXISTING_KEY) &&
(RegQueryValueExW(hentry, DriverW, NULL, NULL, NULL,
&namesize) == ERROR_SUCCESS)) {
TRACE("monitor %s already exists\n", debugstr_w(mi2w->pName));
/* NT: ERROR_PRINT_MONITOR_ALREADY_INSTALLED (3006)
9x: ERROR_ALREADY_EXISTS (183) */