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

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hablich@ -- please help triage this and find the right owner. Thanks.

ClusterFuzz has detected this issue as fixed in range 454791:454794.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5472428240404480

Fuzzer: libfuzzer_v8_wasm_compile_fuzzer
Job Type: libfuzzer_chrome_msan
Platform Id: linux

Crash Type: Use-of-uninitialized-value
Crash Address: 
Crash State:
  v8::internal::wasm::LEBHelper::write_i32v
  v8::internal::wasm::WasmFunctionBuilder::EmitVarInt
  v8::internal::wasm::WasmFunctionBuilder::EmitWithVarInt
  
Sanitizer: memory (MSAN)

Recommended Security Severity: Medium

Regressed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=454233:454247
Fixed: https://cluster-fuzz.appspot.com/revisions?job=libfuzzer_chrome_msan&range=454791:454794

Reproducer Testcase: https://cluster-fuzz.appspot.com/download/AMIfv94bnyBM6c15KcrsUl0wrEmEQ_mqDxZxGUXSVhkI_PleBOhlDhxvmo3FQDv4KDG2UU6vRGHPZjqenxB0LZ2apw1556zxL3j9Vl00pD0ICT9xbiUA3iPmhy-r_2nfmFQFE-RyhIFwg40eTojJBv9DN1LeUhvODeDM6QoLJxznmH5Um1SzMePbtw4cTrTFd-m8tzeJTWQqiWV55WTpWz1oP7A1PdehBz0DBeN4yfCt1UoCd7yXY6lqazACQdYvi7oOreC8WyhvEanXCz_oFMWH68aUwcBgF0ouf0_HqoBoQ-QxCz9zTNpxGzJ7a_pMKZIk7kIFaYyt0PZhmfkTXb_mDPp96Xp7ulqIY_FJxD9wsMycA3POUAk?testcase_id=5472428240404480


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.

Assigning to CF sheriff.

Please merge the fix to 58 when it is isolated.

ClusterFuzz testcase 5472428240404480 is verified as fixed, so closing issue.

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

Your change meets the bar and is auto-approved for M58. Please go ahead and merge the CL to branch 3029 manually. Please contact milestone owner if you have questions.
Owners: amineer@(clank), cmasso@(bling), bhthompson@(cros), govind@(desktop)

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

The fix seems to be fuzzer driver related: https://chromium-review.googlesource.com/448317

and it was not merged to M58 yet.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

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

Please merge your change to M58 branch 3029 before 5:00 PM PT, Monday (03/13/17) so we can take it in for next week dev release. Thank you!

Merged in the original bug: https://bugs.chromium.org/p/chromium/issues/detail?id=697191#c20

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