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This is an assert in GrPorterDuffXPFactory::Get where an invalid blend mode is passed and it returns null.  I think this is just a sanity check assert, as an invalid/null fXPFactory is the default for a GrPaint.  It seems like a bogus SkBlendMode just results in ignoring it.

ClusterFuzz has detected this issue as fixed in range 555640:555648.

Detailed report: https://clusterfuzz.com/testcase?key=4880230200901632

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Abrt
Crash Address: 0x0539000068e7
Crash State:
  sk_abort_no_print
  GrPorterDuffXPFactory::Get
  skpaint_to_grpaint_impl
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=529806:529845
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=555640:555648

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4880230200901632

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.