accept4: don't fall back to accept if we got unknown flags

[musl] / src / network / accept4.c

diff --git a/src/network/accept4.c b/src/network/accept4.c
index 59ab172..765a38e 100644 (file)
--- a/src/network/accept4.c
+++ b/src/network/accept4.c
@@ -9,6 +9,10 @@ int accept4(int fd, struct sockaddr *restrict addr, socklen_t *restrict len, int
        if (!flg) return accept(fd, addr, len);
        int ret = socketcall_cp(accept4, fd, addr, len, flg, 0, 0);
        if (ret>=0 || (errno != ENOSYS && errno != EINVAL)) return ret;
+       if (flg & ~(SOCK_CLOEXEC|SOCK_NONBLOCK)) {
+               errno = EINVAL;
+               return -1;
+       }
        ret = accept(fd, addr, len);
        if (ret<0) return ret;
        if (flg & SOCK_CLOEXEC)