From ba92c07a7577176918348134dd3cca8e92822e1a Mon Sep 17 00:00:00 2001
From: Robin Burchell <robin+git@viroteck.net>
Date: Sat, 18 May 2019 02:00:54 +0200
Subject: [PATCH] Kernel: Make sure to clear FD sets when preparing for a
 select

NULL sets can happen, and we don't want to incorrectly return FDs which
aren't in the set too.
---
 Kernel/Process.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index ea5cd64935..c91d5c1e87 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -1751,9 +1751,9 @@ int Process::sys$select(const Syscall::SC_select_params* params)
     // FIXME: Return -EINVAL if timeout is invalid.
 
     auto transfer_fds = [this, nfds] (fd_set* set, auto& vector) -> int {
+        vector.clear_with_capacity();
         if (!set)
             return 0;
-        vector.clear_with_capacity();
         auto bitmap = Bitmap::wrap((byte*)set, FD_SETSIZE);
         for (int i = 0; i < nfds; ++i) {
             if (bitmap.get(i)) {