[Tarantool-patches] [PATCH v2 0/2] vinyl: fix uninitialized memory accesses

[Nikita Pettik <korablev@tarantool.org>]

It is found that if vy_stmt_alloc() fails (due to OOM or most likely
owing to exceeding max tuple size) during compaction process, it may
result in instance crashes. This patch-set contains two fixes for
problems connected with wrong handling of vy_stmt_alloc() failure.

Branch: https://github.com/tarantool/tarantool/commits/np/gh-4864-access-to-uninit-mem
Issue: https://github.com/tarantool/tarantool/issues/4864

Changes in v2:
 - replaced error injection ERRINJ_VY_MAX_TUPLE_SIZE with
ERRINJ_VY_STMT_ALLOC (i.e. now vy_stmt_alloc() fails not due to exceed
max size, but owing to allocation failure);
 - found another one use-after-free bug in case vy_read_view_merge()
fails. Fix is merged into second patch;
 - added ERRINJ_VY_READ_VIEW_MERGE_FAIL to provide test case in
case of vy_read_view_merge() failure;
 - fixed test covering second bug: error injection value accidentally
was set to a wrong value (bad copy-paste).

@ChangeLog:
* Fixed crash during compaction due to tuples with size exceeding
vinyl_max_tuple_size setting.

Nikita Pettik (2):
  vinyl: init all vars before cleanup in vy_lsm_split_range()
  vinyl: clean-up unprocessed read views in *_build_read_views()

 src/box/vy_lsm.c                              |   4 +-
 src/box/vy_stmt.c                             |  10 +
 src/box/vy_write_iterator.c                   |  23 +-
 src/errinj.h                                  |   2 +
 test/box/errinj.result                        |   2 +
 .../gh-4864-stmt-alloc-fail-compact.result    | 237 ++++++++++++++++++
 .../gh-4864-stmt-alloc-fail-compact.test.lua  | 103 ++++++++
 test/vinyl/suite.ini                          |   2 +-
 8 files changed, 377 insertions(+), 6 deletions(-)
 create mode 100644 test/vinyl/gh-4864-stmt-alloc-fail-compact.result
 create mode 100644 test/vinyl/gh-4864-stmt-alloc-fail-compact.test.lua

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2.17.1