tree 5430eb3a1a2518b899f1ae87b5f3cba394ba92b6
parent 527a0bbf2502501ec349ba6397ca1289dd4169ab
author Ben Clayton <bclayton@google.com> 1613764903 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1613764903 +0000

Fix infinite spin in wgsl parser

If the parser hits a `maximum parser recursive depth reached` situation, then we need to try and resynchronize the parser.

If we fail to do this, then the synchronized_ flag may remain true, and the parser will believe progress is still being made.
In this situation the parser may try to reparse the same token, forever.

By calling sync_to() we either find the end of the block, and forward progress can be made, or synchronized_ is set to false, and the parser can error out cleanly.

Add test case from fuzzer report.

Fixed: chromium:1180128
Change-Id: I893077677fd3dfbd4b9b400cd32db842b06db500
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/42029
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>