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reftable/block: check deflateInit() return value 

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>
jch
Johannes Schindelin 2026-07-14 22:48:36 +00:00 committed by Junio C Hamano
parent 6e1e922eb8
commit ae1ca21ac3
1 changed files with 2 additions and 1 deletions
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3
reftable/block.c
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@ -87,7 +87,8 @@ int block_writer_init(struct block_writer *bw, uint8_t typ, uint8_t *block,
REFTABLE_CALLOC_ARRAY(bw->zstream, 1);
if (!bw->zstream)
return REFTABLE_OUT_OF_MEMORY_ERROR;
deflateInit(bw->zstream, 9);
if (deflateInit(bw->zstream, 9) != Z_OK)
return REFTABLE_ZLIB_ERROR;
}

return 0;