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51fed14d73
If a WAL record header was split across pages, but xl_tot_len was 0, we would get confused and conclude that we had already read the whole record, and proceed to CRC check it. That can lead to a crash in RecordIsValid(), which isn't careful to not read beyond end-of-record, as defined by xl_tot_len. Add an explicit sanity check for xl_tot_len <= SizeOfXlogRecord. Also, make RecordIsValid() more robust by checking in each step that it doesn't try to access memory beyond end of record, even if a length field in the record's or a backup block's header is bogus. Per report and analysis by Tom Lane. |
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