Check the 'mtablock' for negative value

diff --git a/util/fusermount.c b/util/fusermount.c
index c37e57ba3195ae05a06df71de190378ab891ad2d..85292fb28e294d7dd1598e939f32b03d7b8a54ee 100644 (file)
--- a/util/fusermount.c
+++ b/util/fusermount.c
@@ -124,8 +124,10 @@ static int lock_umount(void)
 
 static void unlock_umount(int mtablock)
 {
-       lockf(mtablock, F_ULOCK, 0);
-       close(mtablock);
+       if (mtablock >= 0) {
+               lockf(mtablock, F_ULOCK, 0);
+               close(mtablock);
+       }
 }
 
 static int add_mount(const char *source, const char *mnt, const char *type,