[release/9.0] Fix MultipartReaderStream synchronous read when using buffer offset #59422
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Backport of #59360 to release/9.0
/cc @BrennanConroy
Fix MultipartReaderStream synchronous read when using buffer offset
Description
When synchronously reading a multipart section and using a non-zero offset value for the passed in buffer, we incorrectly ignored the offset and would write into the buffer starting at the beginning. This would overwrite previous data in the buffer which corrupts the user payload.
Fixes #59269
Customer Impact
Corrupted buffer data for a multipart section.
Regression?
Regressed in 9.0
Risk
Silly error around not using the buffer
offset. Added missing test coverage.Verification
Packaging changes reviewed?