RFR: 8373626: [asan] read past end of buffer in sun.awt.image.ImagingLib.convolveBI [v3]

[Sergey Bylokhov]

On Thu, 22 Jan 2026 17:57:42 GMT, Phil Race <prr at openjdk.org> wrote:

>> Some of the medialib native functions implementing Convolve read data from arrays when it is not needed or used instead of reading just what is needed and used.
>> This is detected as a read out of bounds. It is limited and hasn't been seen to result in any crashes without ASAN, and the OOB values that are read are never used so there's a very limited problem.
>> The changes here make the mlib_ImageConv_*nw.c files match what happens in the mlib_ImageConv_*ext.c files which read just the data they need.
>> The changes are fairly mechanical but there could be copy/paste errors for a reviewer to find.
>> 
>> Not easy to provide a test case, building with --enable-asan is needed and for me it works only on macOS.
>> I did that and ran all our existing automated tests on our CI systems.
>
> Phil Race has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8373626

I’m trying to understand if it’s possible to create a test that catches that typo. It looks like this code path is not covered.

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PR Comment: https://git.openjdk.org/jdk/pull/29257#issuecomment-3825601044