From 6862747c484e42ae8cc8caa02647d243dfe5502f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <zhangsongcui3371@sina.com>
Date: Fri, 26 Jul 2024 08:45:38 +0800
Subject: [PATCH] GPU (macOS): fix possible segfault when detecting GPU
 frequency (M1 Air)

Fix #1122
---
 src/detection/gpu/gpu_apple.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/detection/gpu/gpu_apple.c b/src/detection/gpu/gpu_apple.c
index c63974d1f..be74022c0 100644
--- a/src/detection/gpu/gpu_apple.c
+++ b/src/detection/gpu/gpu_apple.c
@@ -53,7 +53,7 @@ static const char* detectFrequency(FFGPUResult* gpu)
         return "\"pmgr\" should conform to \"AppleARMIODevice\"";
 
     FF_CFTYPE_AUTO_RELEASE CFDataRef freqProperty = (CFDataRef) IORegistryEntryCreateCFProperty(entryDevice, CFSTR("voltage-states9-sram"), kCFAllocatorDefault, kNilOptions);
-    if (CFGetTypeID(freqProperty) != CFDataGetTypeID())
+    if (!freqProperty || CFGetTypeID(freqProperty) != CFDataGetTypeID())
         return "\"voltage-states9-sram\" in \"pmgr\" is not found";
 
     // voltage-states5-sram stores supported <frequency / voltage> pairs of gpu from the lowest to the highest