piman: Uh oh! This issue still open and hasn't been updated in the last 14 days. This is a serious vulnerability, and we want to ensure that there's progress. Could you please leave an update with the current status and any potential blockers?

If you're not the right owner for this issue, could you please remove yourself as soon as possible or help us find the right one?

If the issue is fixed or you can't reproduce it, please close the bug. If you've started working on a fix, please set the status to Started.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

piman: Uh oh! This issue still open and hasn't been updated in the last 28 days. This is a serious vulnerability, and we want to ensure that there's progress. Could you please leave an update with the current status and any potential blockers?

If you're not the right owner for this issue, could you please remove yourself as soon as possible or help us find the right one?

If the issue is fixed or you can't reproduce it, please close the bug. If you've started working on a fix, please set the status to Started.

Thanks for your time! To disable nags, add the Disable-Nags label.

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

I'll take a look

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/38c3be3e1d35d839e87eba82c38459fbb971c9aa

commit 38c3be3e1d35d839e87eba82c38459fbb971c9aa
Author: kainino <kainino@chromium.org>
Date: Fri Mar 10 00:05:47 2017

Initialize variable in QueryTimestampBits

BUG= 675450 
TBR=kbr@chromium.org

Review-Url: https://codereview.chromium.org/2741093002
Cr-Commit-Position: refs/heads/master@{#455914}

[modify] https://crrev.com/38c3be3e1d35d839e87eba82c38459fbb971c9aa/ui/gl/gpu_timing.cc

ClusterFuzz has detected this issue as fixed in range 455893:455920.

Detailed report: https://clusterfuzz.com/testcase?key=5964355612180480

Fuzzer: libfuzzer_gpu_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  gl::GPUTimingImpl::DoTimeStampQuery
  gl::GPUTimer::QueryTimeStamp
  gpu::gles2::TimeStampQuery::QueryCounter
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_msan&range=455893:455920

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv94MlHZTOtQ4okTb9m41rRKCQBbu2AniLD5TgYahFpu872fxRua-9WDWq0NTfTWPCXkUNVVsdX0UcW8HkVHkgoJxpWsI9BoBocLBfwYkH2gZ4RzD3iQ5jDCsgTtszYrz7smm0EbmLetX8lbTYuzvsIk0QEL-1bKaF7r6FTaKCZD8Ol2yawd6ofTsRlOlAhevnouF05GBms7pdS6r3XrI1PbW0HFe0OW157bIoCsf3AgpB3zfg9ESbAsLG5aOUMfHVz6wDb7Jg52jnf3yPxX_CCtvAf-0e5xCxP46icpb-k3Hyf4VtSbpxZ3xjqHUwlfN3A3m3T-DZ2XQ-PmdG_cZEnkeS0Bp2RZgqHbUD4dqZmEWYLfkHlY?testcase_id=5964355612180480


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.

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