spoolss: fix segfault when "default devmode" is disabled

Currently when "default devmode" is explicitly disabled, and a printer
is added with a null device mode, spoolssd crashes in copy_devicemode().

Both construct_printer_info2() and construct_printer_info8() code paths
currently unconditionally attempt to copy a printers device mode,
without checking whether one is present.

This change fixes this regression such that construct_printer_info*()
functions check for a null device mode before copying.

https://bugzilla.samba.org/show_bug.cgi?id=9433

Reviewed-by: Andreas Schneider <asn@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu Nov 29 13:03:05 CET 2012 on sn-devel-104

1 files changed, 34 insertions, 18 deletions

diff --git a/source3/rpc_server/spoolss/srv_spoolss_nt.c b/source3/rpc_server/spoolss/srv_spoolss_nt.c
index ff342dea92..b8ee9f4072 100644
--- a/source3/rpc_server/spoolss/srv_spoolss_nt.c
+++ b/source3/rpc_server/spoolss/srv_spoolss_nt.c
@@ -1938,24 +1938,12 @@ WERROR _spoolss_OpenPrinterEx(struct pipes_struct *p,
 	 * save it here in case we get a job submission on this handle
 	 */
 
-	 if ((Printer->printer_type != SPLHND_SERVER) &&
-	     r->in.devmode_ctr.devmode) {
+	 if ((Printer->printer_type != SPLHND_SERVER)
+	  && (r->in.devmode_ctr.devmode != NULL)) {
 		copy_devicemode(NULL, r->in.devmode_ctr.devmode,
 				&Printer->devmode);
 	 }
 
-#if 0	/* JERRY -- I'm doubtful this is really effective */
-	/* HACK ALERT!!! Sleep for 1/3 of a second to try trigger a LAN/WAN
-	   optimization in Windows 2000 clients  --jerry */
-
-	if ( (r->in.access_mask == PRINTER_ACCESS_ADMINISTER)
-		&& (RA_WIN2K == get_remote_arch()) )
-	{
-		DEBUG(10,("_spoolss_OpenPrinterEx: Enabling LAN/WAN hack for Win2k clients.\n"));
-		usleep( 500000 );
-	}
-#endif
-
 	return WERR_OK;
 }
 
@@ -4030,8 +4018,22 @@ static WERROR construct_printer_info2(TALLOC_CTX *mem_ctx,
 	r->cjobs		= count;
 	r->averageppm		= info2->averageppm;
 
-	copy_devicemode(mem_ctx, info2->devmode, &r->devmode);
-	if (!r->devmode) {
+	if (info2->devmode != NULL) {
+		result = copy_devicemode(mem_ctx,
+					 info2->devmode,
+					 &r->devmode);
+		if (!W_ERROR_IS_OK(result)) {
+			return result;
+		}
+	} else if (lp_default_devmode(snum)) {
+		result = spoolss_create_default_devmode(mem_ctx,
+							info2->printername,
+							&r->devmode);
+		if (!W_ERROR_IS_OK(result)) {
+			return result;
+		}
+	} else {
+		r->devmode = NULL;
 		DEBUG(8,("Returning NULL Devicemode!\n"));
 	}
 
@@ -4201,8 +4203,22 @@ static WERROR construct_printer_info8(TALLOC_CTX *mem_ctx,
 		return result;
 	}
 
-	copy_devicemode(mem_ctx, info2->devmode, &r->devmode);
-	if (!r->devmode) {
+	if (info2->devmode != NULL) {
+		result = copy_devicemode(mem_ctx,
+					 info2->devmode,
+					 &r->devmode);
+		if (!W_ERROR_IS_OK(result)) {
+			return result;
+		}
+	} else if (lp_default_devmode(snum)) {
+		result = spoolss_create_default_devmode(mem_ctx,
+							info2->printername,
+							&r->devmode);
+		if (!W_ERROR_IS_OK(result)) {
+			return result;
+		}
+	} else {
+		r->devmode = NULL;
 		DEBUG(8,("Returning NULL Devicemode!\n"));
 	}