diff options
Diffstat (limited to 'src/liolib.c')
| -rw-r--r-- | src/liolib.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/liolib.c b/src/liolib.c index 8a9e75cd089a7..027d4bd0db450 100644 --- a/src/liolib.c +++ b/src/liolib.c @@ -277,6 +277,8 @@ 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; |