RFR: 8345390: [ubsan] systemDictionaryShared.cpp:964: member call on null pointer

[Ioi Lam]

On Thu, 5 Dec 2024 08:45:31 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> (For JDK 25).
>> 
>> It's possible for the  `member_method` parameter to be `nullptr`. Since `member_method->is_shared()` only checks the range of `this` and doesn't dereference it, we don't have a crash, and the problem was found only when running with ubsan.
>> 
>> However, the code was wrong, as `((Method*)nullptr)->is_shared()` would return `false`, making it impossible to load the archived Lambda class.
>> 
>> After the fix, I modified the test case to ensure that the Lambda class can be correctly loaded from the archive.
>
> Marked as reviewed by mbaesken (Reviewer).

Thanks @MBaesken and @kimbarrett for the review

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PR Comment: https://git.openjdk.org/jdk/pull/22560#issuecomment-2529389745