Mryange opened a new pull request, #64788:
URL: https://github.com/apache/doris/pull/64788
### What problem does this PR solve?
`from_base64` and `from_base64_binary` call the base64 decoder after sizing
the output buffer from `len / 4 * 3`. For invalid input whose length is not a
multiple of four, this can pass an undersized destination buffer into the
decoder before the function marks the row as invalid.
Root cause: the functions only handled decoder failure after invoking the
decoder, but did not reject impossible base64 lengths first.
This patch returns `NULL` for inputs with invalid base64 length before
decoding, keeping the existing invalid-input SQL behavior while avoiding unsafe
decoder calls.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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