[PATCH v11 03/27] tools/libxenevtchn: check xenevtchn_open() flags for not supported bits

[Juergen Gross <jgross@xxxxxxxx>]

Refuse a call of xenevtchn_open() with unsupported bits in flags being
set.

Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V11:
- new patch (Andrew Cooper)
---
 tools/libs/evtchn/core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/libs/evtchn/core.c b/tools/libs/evtchn/core.c
index 50bae8ec0d..581a14e3df 100644
--- a/tools/libs/evtchn/core.c
+++ b/tools/libs/evtchn/core.c
@@ -13,6 +13,7 @@
  * License along with this library; If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
 
@@ -31,9 +32,16 @@ static int all_restrict_cb(Xentoolcore__Active_Handle *ah, 
domid_t domid)
 
 xenevtchn_handle *xenevtchn_open(xentoollog_logger *logger, unsigned int flags)
 {
-    xenevtchn_handle *xce = malloc(sizeof(*xce));
+    xenevtchn_handle *xce;
     int rc;
 
+    if ( flags )
+    {
+        errno = EINVAL;
+        return NULL;
+    }
+
+    xce = malloc(sizeof(*xce));
     if ( !xce )
         return NULL;
 
-- 
2.26.2