tree 1cd001fa9c037c28692a510266e99f78654ead48
parent 43a157cf27b62edef4a4889b77476079608610ca
author John Stiles <johnstiles@google.com> 1630035299 -0400
committer SkCQ <skcq-be@skia-corp.google.com.iam.gserviceaccount.com> 1630072881 +0000

Fix invalid variable ref-kind discovered by fuzzer.

No-op arithmetic simplification will convert expressions like `x += 0`
to `x`. When making this simplification, we will also downgrade the ref-
kind of `x` from "write" to "read" since the new expression is no longer
an assignment.

The fuzzer discovered that the ref-kind downgrade was too aggressive,
and would also traverse into nested subexpressions and downgrade them
as well. That is, for `x[y=z] += 0` would convert both `x` and `y`
into "read" references, which is incorrect; `y` is still being written
to.

The fuzzer managed to turn this mistake into an assertion by leveraging
a separate optimization. It added a leading, side-effect-less comma
expression for us to detect as worthless and eliminate. In doing so, we
clone the expression with the busted ref-kind, triggering an assertion.

Change-Id: I42fc31f6932f679ae875e2b49db2ad2f4e89e2cb
Bug: oss-fuzz:37677
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/442536
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>