Bug 305539 – Crash under WTF::Persistence::Decoder::operator>>

• Component: Page Loading
• Status: RESOLVED FIXED

[Chris Dumez]

Crash under WTF::Persistence::Decoder::operator>>:
```
Thread 4 Crashed:: :
0   JavaScriptCore                	       0x1b2be5430 void WTF::memcpySpan<unsigned char, 18446744073709551615ul, unsigned char const, 18446744073709551615ul>(std::__1::span<unsigned char, 18446744073709551615ul>, std::__1::span<unsigned char const, 18446744073709551615ul>) + 0 (Source/WTF/wtf/StdLibExtras.h:1068) [inlined]
1   JavaScriptCore                	       0x1b2be5430 WTF::Persistence::Decoder& WTF::Persistence::Decoder::decodeNumber<unsigned int>(std::__1::optional<unsigned int>&) + 72 (Source/WTF/wtf/persistence/PersistentDecoder.cpp:84) [inlined]
2   JavaScriptCore                	       0x1b2be5430 WTF::Persistence::Decoder::operator>>(std::__1::optional<unsigned int>&) + 72 (Source/WTF/wtf/persistence/PersistentDecoder.cpp:114)
3   WebKit                        	       0x1b1ba6f78 WebKit::decodeRecordMetaData(std::__1::span<unsigned char const, 18446744073709551615ul>) + 68 (Source/WebKit/NetworkProcess/storage/CacheStorageDiskStore.cpp:163) [inlined]
4   WebKit                        	       0x1b1ba6f78 WebKit::readRecordInfoFromFileData(std::__1::array<unsigned char, 8ul> const&, std::__1::span<unsigned char const, 18446744073709551615ul>) + 156 (Source/WebKit/NetworkProcess/storage/CacheStorageDiskStore.cpp:290)
5   WebKit                        	       0x1b1ba6f78 WebKit::decodeRecordMetaData(std::__1::span<unsigned char const, 18446744073709551615ul>) + 68 (/Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/NetworkProcess/storage/CacheStorageDiskStore.cpp:163) [inlined]
6   WebKit                        	       0x1b1ba6f78 WebKit::readRecordInfoFromFileData(std::__1::array<unsigned char, 8ul> const&, std::__1::span<unsigned char const, 18446744073709551615ul>) + 156 (Source/WebKit/NetworkProcess/storage/CacheStorageDiskStore.cpp:290)
7   WebKit                        	       0x1b1bba4ec WebKit::CacheStorageDiskStore::readRecordFromFileData(std::__1::span<unsigned char const, 18446744073709551615ul>, WTF::FileSystemImpl::MappedFileData&&) + 20 (Source/WebKit/NetworkProcess/storage/CacheStorageDiskStore.cpp:314) [inlined]
```

[Chris Dumez]

rdar://155698666

[Chris Dumez]

Pull request: https://github.com/WebKit/WebKit/pull/56617

[EWS]

Committed 305698@main (d939960fe8b1): <https://commits.webkit.org/305698@main>

Reviewed commits have been landed. Closing PR #56617 and removing active labels.