From 384b2d7c8be97bb52eed789662b4b97f5a58ab17 Mon Sep 17 00:00:00 2001
From: DreamPiggy <lizhuoli1126@126.com>
Date: Fri, 11 Nov 2022 14:22:49 +0800
Subject: [PATCH] Fix the missing lock for callbackTokens which may cause
 thread-safe issue

---
 SDWebImage/Core/SDWebImageDownloaderOperation.m | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/SDWebImage/Core/SDWebImageDownloaderOperation.m b/SDWebImage/Core/SDWebImageDownloaderOperation.m
index 837883e2..3c0c8abd 100644
--- a/SDWebImage/Core/SDWebImageDownloaderOperation.m
+++ b/SDWebImage/Core/SDWebImageDownloaderOperation.m
@@ -244,7 +244,10 @@
             self.coderQueue.qualityOfService = NSQualityOfServiceDefault;
         }
         [self.dataTask resume];
-        NSArray<SDWebImageDownloaderOperationToken *> *tokens = [self.callbackTokens copy];
+        NSArray<SDWebImageDownloaderOperationToken *> *tokens;
+        @synchronized (self) {
+            tokens = [self.callbackTokens copy];
+        }
         for (SDWebImageDownloaderOperationToken *token in tokens) {
             if (token.progressBlock) {
                 token.progressBlock(0, NSURLResponseUnknownLength, self.request.URL);