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

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

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

+awhalley@, PTAL and assign to appropriate dev pls. Thank you.

Doesn't look like a security bug.

I think the type of LLVMFuzzerInitiailize is wrong here: https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/template_url_parser_fuzzer.cc?q=template_url_parser_fuzzer&sq=package:chromium&dr&l=37. argc should be a "int *", not "int".

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9b527d070abae69331733a6e17a766820ef65002

commit 9b527d070abae69331733a6e17a766820ef65002
Author: Oliver Chang <ochang@chromium.org>
Date: Mon Feb 19 03:35:59 2018

template_url_parser_fuzzer: Fix type of LLVMFuzzerInitialize.

TBR=inferno@chromium.org

Bug:  813188 
Change-Id: I70b1d84cc6e9f0538b7faac7ba27ce09c5bffab6
Reviewed-on: https://chromium-review.googlesource.com/923922
Reviewed-by: Oliver Chang <ochang@chromium.org>
Commit-Queue: Oliver Chang <ochang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537576}
[modify] https://crrev.com/9b527d070abae69331733a6e17a766820ef65002/testing/libfuzzer/fuzzers/template_url_parser_fuzzer.cc

ClusterFuzz has detected this issue as fixed in range 537575:537576.

Detailed report: https://clusterfuzz.com/testcase?key=4838165264465920

Fuzzer: libFuzzer_template_url_parser_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Incorrect-function-pointer-type
Crash Address: 
Crash State:
  NULL
Sanitizer: undefined (UBSAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=525358:525376
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=537575:537576

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4838165264465920

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.

ClusterFuzz testcase 4838165264465920 is verified as fixed, so closing issue as verified.

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