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Diffstat (limited to 'Build/source/libs/lua53/lua53-src/src/liolib.c')
-rw-r--r--Build/source/libs/lua53/lua53-src/src/liolib.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/Build/source/libs/lua53/lua53-src/src/liolib.c b/Build/source/libs/lua53/lua53-src/src/liolib.c
index 76f372acbe8..62b18f075b7 100644
--- a/Build/source/libs/lua53/lua53-src/src/liolib.c
+++ b/Build/source/libs/lua53/lua53-src/src/liolib.c
@@ -280,6 +280,8 @@ static int io_popen (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
LStream *p = newprefile(L);
+ luaL_argcheck(L, ((mode[0] == 'r' || mode[0] == 'w') && mode[1] == '\0'),
+ 2, "invalid mode");
p->f = l_popen(L, filename, mode);
p->closef = &io_pclose;
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;