From 04539d4930733d5f2c293273f3c94290c41c4573 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 6 Feb 2022 01:25:32 +0100
Subject: [PATCH] Kernel: Propagate sys$profiling_enable() buffer allocation
 failure

Caught a kernel panic when enabling profiling of all threads when there
was very little memory available.
---
 Kernel/Syscalls/profiling.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Kernel/Syscalls/profiling.cpp b/Kernel/Syscalls/profiling.cpp
index a244219ad1..251eee7a5c 100644
--- a/Kernel/Syscalls/profiling.cpp
+++ b/Kernel/Syscalls/profiling.cpp
@@ -26,10 +26,15 @@ ErrorOr<FlatPtr> Process::sys$profiling_enable(pid_t pid, u64 event_mask)
             return EPERM;
         ScopedCritical critical;
         g_profiling_event_mask = PERF_EVENT_PROCESS_CREATE | PERF_EVENT_THREAD_CREATE | PERF_EVENT_MMAP;
-        if (g_global_perf_events)
+        if (g_global_perf_events) {
             g_global_perf_events->clear();
-        else
+        } else {
             g_global_perf_events = PerformanceEventBuffer::try_create_with_size(32 * MiB).leak_ptr();
+            if (!g_global_perf_events) {
+                g_profiling_event_mask = 0;
+                return ENOMEM;
+            }
+        }
 
         SpinlockLocker lock(g_profiling_lock);
         if (!TimeManagement::the().enable_profile_timer())