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

There's nothing obvious to me in the regression range, though I don't know what pdfium depends on (webkit?)

Tom -- Can you take a look?

ClusterFuzz has detected this issue as fixed in range 464315:464333.

Detailed report: https://clusterfuzz.com/testcase?key=5744815947120640

Fuzzer: libfuzzer_pdf_cfx_saxreader_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  CFX_SAXReader::ParseChar
  CFX_SAXReader::ContinueParse
  _start
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_msan&range=464294:464315
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_msan&range=464315:464333

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv95DHX2NxshCwrdwEC-N3BfBEXS-gEMqhdp6QAOOJmkQ0pot7W8GX_pE-71mak_ys9XaolqtEShQQ0p2KNdhPtZm4cjRVYGDsct7-rVf2mgFfRReDILyjRIQonCNVnDNTMi4FUGM-3HRjyPUwwOtu8RGpn0qCi_jniuIH9F4tCMh5PhE7SKwaPBuJmujhOiz4w_YLZO5k4qHI2HV7a8h0yyjS9sV346AnrDpnJKccOhqrxi_SuUx45G8ezEZlZ9PoTEmCB21GajOpIMRVxPxLw5Y5n2i92MdEX6JkSsnb7pmDPMbf9GNDcMCpqGALjanMdOnLX0MD6iIWV3eMSi3cUrEsElDofzlDJabjPnzx9dQpvkN2AI?testcase_id=5744815947120640


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 5744815947120640 is verified as fixed, so closing issue.

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

We should verify if this was fixed.

This is XFA code, so not enabled in ToT. Removing the Security_Impact-Head.

https://pdfium-review.googlesource.com/4230 should have taken care of this.

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

We have made a bunch of changes on ClusterFuzz side, so resetting ClusterFuzz-Wrong label.