From: Jeremy Allison <jra@samba.org>
Date: Tue, 2 Jan 2018 23:56:03 +0000 (-0800)
Subject: CVE-2018-1050: s3: RPC: spoolss server. Protect against null pointer derefs.
X-Git-Tag: samba-4.6.14~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=189d12940caffa66e6a11e226591bb2a20d4fa34;p=thirdparty%2Fsamba.git

CVE-2018-1050: s3: RPC: spoolss server. Protect against null pointer derefs.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11343

Signed-off-by: Jeremy Allison <jra@samba.org>
---

diff --git a/source3/rpc_server/spoolss/srv_spoolss_nt.c b/source3/rpc_server/spoolss/srv_spoolss_nt.c
index a9e778ee023..ef147e970e6 100644
--- a/source3/rpc_server/spoolss/srv_spoolss_nt.c
+++ b/source3/rpc_server/spoolss/srv_spoolss_nt.c
@@ -182,6 +182,11 @@ static void prune_printername_cache(void);
 static const char *canon_servername(const char *servername)
 {
 	const char *pservername = servername;
+
+	if (servername == NULL) {
+		return "";
+	}
+
 	while (*pservername == '\\') {
 		pservername++;
 	}
@@ -2082,6 +2087,10 @@ WERROR _spoolss_DeletePrinterDriver(struct pipes_struct *p,
 		return WERR_ACCESS_DENIED;
 	}
 
+	if (r->in.architecture == NULL || r->in.driver == NULL) {
+		return WERR_INVALID_ENVIRONMENT;
+	}
+
 	/* check that we have a valid driver name first */
 
 	if ((version = get_version_id(r->in.architecture)) == -1) {
@@ -2221,6 +2230,10 @@ WERROR _spoolss_DeletePrinterDriverEx(struct pipes_struct *p,
 		return WERR_ACCESS_DENIED;
 	}
 
+	if (r->in.architecture == NULL || r->in.driver == NULL) {
+		return WERR_INVALID_ENVIRONMENT;
+	}
+
 	/* check that we have a valid driver name first */
 	if (get_version_id(r->in.architecture) == -1) {
 		/* this is what NT returns */