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This code was trying to iterate codepoints, but didn't reslice the string,
so it was reading the first codepoint over and over, if the string length was
not a multiple of the first codepoint length, this would cause to overshoot
past the end of the string.
This was a latent bug introduced in CL 384265 but was revealed to
Ngolo-fuzzing in OSS-Fuzz in CL 397277.
Fixes #52353
Change-Id: I13f0352e6ad13a42878927f3b1c18c58360dd40c
GitHub-Last-Rev: 424f6cfad1bc7d66314911e6b4b4ce6751330435
GitHub-Pull-Request: golang/go#52356
Reviewed-on: https://go-review.googlesource.com/c/go/+/400240
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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