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

**** Bulk edit -  please ignore if not applicable ****

This bug  is reported as M55 Beta blocker and we're getting closer to M55 Beta promotion. 
Please plan to have fix ready and merged to M55 branch (2883) by 5:00 PM PT, Monday(10/10) so it has enough baking time in Dev before Beta promotion. Thank you.

tsepez: If you have time, can you take this as well?

https://codereview.chromium.org/2406893003 fixes this too.

ClusterFuzz has detected this issue as fixed in range 424153:424757.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6717444578344960

Fuzzer: ifratric_pdf_generic
Job Type: linux_asan_pdfium
Platform Id: linux

Crash Type: Heap-use-after-free READ 8
Crash Address: 0x6040001170e8
Crash State:
  CPDFSDK_Document::KillFocusAnnot
  CPDFSDK_Document::~CPDFSDK_Document
  FPDFDOC_ExitFormFillEnvironment
  
Recommended Security Severity: High

Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_pdfium&range=423265:423391
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_pdfium&range=424153:424757

Minimized Testcase (3533.45 Kb): https://cluster-fuzz.appspot.com/download/AMIfv972CjoyS2uyGkbWB7xSkwYnt76hf4TVJhWvM17LB7utijRnwWAjjfRKDyE0o7o3vE9s9yPpjMJxBq4sXMxeOhPT0x4NyZaq-kgm-xss0JRZ2_0FgOhkFN8t-P4IhCMiFSyCr-SRoHFBefHNOhc5fLL8KaPMg97erAVIp34aB_ntxFmnx-U?testcase_id=6717444578344960

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

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

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