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

reed@, could you help triage this issue? Thanks!

This smells like we're reading off the end of the table color filter's table.  A safety clamp_0, clamp_1 after unpremul might do the trick?  I'd kind of want to see this repro to be sure.

I think whatever's going on here will be incidentally fixed by rolling out the new linear<->sRGB color filters.

mtklein: assigning to you to remove from the sheriff queue. Feel free to re-assign as needed. Thanks!

A friendly reminder that M61 branch is coming soon on 07/20! Your bug is labelled as Stable ReleaseBlock, pls make sure to land the fix ASAP to trunk. This way we branch M61 from a high quality trunk. Thank you.

I suspect https://chromium-review.googlesource.com/c/560151/ will incidentally fix this by moving away from the crashing table-lookup code to using math.  If it doesn't land tomorrow or landing doesn't fix it, I'll definitely investigate a more focused fix.

ClusterFuzz testcase 4850680979521536 is verified as fixed, so closing issue.

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

ClusterFuzz has detected this issue as fixed in range 487647:487701.

Detailed report: https://clusterfuzz.com/testcase?key=5504640350420992

Fuzzer: inferno_twister_c
Job Type: linux_asan_chrome_mp
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x61a080004318
Crash State:
  _sk_byte_tables_avx
  SkBlitter::blitV
  antifilldot8
  
Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_mp&range=482664:482716
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_mp&range=487647:487701

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5504640350420992


See https://github.com/google/clusterfuzz-tools 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