mirror of
https://github.com/git/git.git
synced 2026-08-09 09:34:14 +00:00
dfb899a959
block_writer_init() allocates a z_stream and calls deflateInit() to prepare it for compressing log records. The return value of deflateInit() is silently discarded. If zlib initialization fails (e.g., Z_MEM_ERROR when the system is under memory pressure), the z_stream is left in an undefined state. Subsequent deflate() calls in block_writer_finish() then operate on this uninitialized stream. Depending on the zlib implementation, this can produce silently corrupted compressed data (which would be written to the reftable file and discovered only when a later reader fails to inflate) or crash outright. The function already uses REFTABLE_ZLIB_ERROR for deflate() failures later in the code path (lines 171, 199), so returning the same error code for deflateInit() failure is consistent. Pointed out by Coverity. Assisted-by: Claude Opus 4.6 Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>