This issue is a security regression. If you are not able to fix this quickly, please revert the change that introduced it.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

+dsinclair: looks like an XFA issue. I've dropped the severity to medium.

Oops, that should be have been dropped to None.

ClusterFuzz has detected this issue as fixed in range 462361:462374.

Detailed report: https://clusterfuzz.com/testcase?key=5720214777102336

Fuzzer: libfuzzer_pdfium_xfa_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x000005321790
Crash State:
  Bad-cast to CXFA_ContainerLayoutItem from CXFA_FFSubForm
  CXFA_LayoutPageMgr::MergePageSetContents
  CXFA_LayoutPageMgr::SyncLayoutData
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=462348:462361
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=462361:462374

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv95utSdP4nSGzZnHYdvrA2VRRXOr_c3rBv_hdQJmHsX-MV8vvyYw_N4Q6s89mmxQ1j1_VoCBIaKm8UKe6ZKtxWavhDZxedJ1GXgtulWE56WxuYgbWabKBjaSlJSQgRH9krKLzwlx3ls0M6PrvZZvodOMZ_sWv5AsQNgjs8OPRwPi2CCrS7UJJF2Ewrjl4LBPrKO5E2Vf4REEHP9IPh_hy5NcAyqUSDEKTLyllbQDkuTXAWE1OLvdk7cC2wknyzsPWFRXGB_t8PZiLClRRZpTdcgIt5g8lEjx8cQefTCt_lqS95T_fSfQEosBspj72rYix2NR5FMIEn_cwGWdY9kLvNsPpH2Xf2eJAXaoh4bOt-0Qs1JiNKvUiosUSRPM8g_ZktK1duqwFO-T8foyTYS0WQ3vKY1Z9A?testcase_id=5720214777102336


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

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

ClusterFuzz testcase 5720214777102336 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot