[v23.2.x] compression: Allocate memory for LZ4_compressEnd #17160
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Before this change the code assumed that the destination temp. buffer always had enough free space for LZ4F_compressEnd operation. This change checks the free size before calling LZ4F_compressEnd and allocates a new buffer if necessary. Note that the free space required is computed using LZ4F_compressBound with a srcSize of 0. By looking at LZ4F_compressEnd it may appear that we can just check if 12 bytes are free in the destination buffer, whereas LZ4F_compressBound always assumes at least 65443 ie 65535 + block header size (4) + frame footer (4). However, lz4frame docstring for LZ4F_compressBound states that: "When srcSize==0, LZ4F_compressBound() provides an upper bound for LZ4F_flush() and LZ4F_compressEnd() instead." Similar directions are mentioned on LZ4 gh issues, so it is safer to be conservative and possibly allocate the extra bytes. (cherry picked from commit 1493c6d)
abhijat
approved these changes
Mar 18, 2024
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CI failure: #8217 |
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Backport of PR #17156