[OpenJDK 2D-Dev] [9] RFR: [JDK-6852563] ArrayOutOfBoundException when reading RLE8 compressed bitmap

[Philip Race]

That was deja vu all over again.
I wonder if there is some additional sharing that can be done here
between RLE4 and RLE8. But not right now .. just something to think about.

+1

-phil.


On 2/6/17, 7:46 PM, Prahalad Kumar Narayanan wrote:
> Hello Everyone
>
> Good day to you.
>
> Request your time in reviewing the fix for the bug
> [JDK-6852563] ArrayOutOfBoundException when reading RLE8 compressed bitmap
>
> Root Cause
>      . The issue is similar to JDK-8167278 except for the difference in the Bitmap's compression format.
>      . The issue surfaces when either of the following holds true-
>              . When a malformed RLE8 bitmap image is decoded /or
>              . When a valid RLE8 bitmap image with 'Delta sequence' is decoded.
>
> Details on the Fix:
>      . Necessary guard conditions have been put in RLE8 bitmap decoding code.
>      . Handling of Delta encoding (0x00 0x02 xOffset yOffset) in source image has been corrected with appropriate logic.
>      . [Note] No regression test case has been provided with the fix.
>              . The fix will require input RLE8 bitmap as mentioned in the root cause.
>              . When we tried to create one such bitmap using Gimp editor, the resulting image didn't contain corruption /or the delta sequence to trigger the issue.
>              . However, the fix was tested with all RLE8 Bitmap images from bitmap test suite (including corrupt images) and no issues were seen.
>
> Other Details:
>      . The fix was run through both Jtreg and JCK test suites. No regressions were noticed.
>
> The changes are available for your review under:
>      Link: http://cr.openjdk.java.net/~pnarayanan/6852563/webrev.00/
>
> Kindly review the changes at your convenience and share your feedback.
>
> Thank you for your time in review
> Have a good day
>
> Prahalad N.