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| author | Sergei Petrunia <sergey@mariadb.com> | 2022-04-26 23:29:29 +0300 |
|---|---|---|
| committer | Sergei Petrunia <sergey@mariadb.com> | 2022-04-29 11:00:37 +0300 |
| commit | 8db9aa496c59e48238ed5718d683fb6bf2ae2445 (patch) | |
| tree | 66a006f61fa64dc5e1cb509d655fa90c11031a59 /sql/sql_select.cc | |
| parent | 3f68c2169e16814e8e268d0f9a9f29aee522453e (diff) | |
| download | mariadb-git-8db9aa496c59e48238ed5718d683fb6bf2ae2445.tar.gz | |
MDEV-28268: Server crashes in Expression_cache_tracker::fetch_current_stats
(cherry-pick into preview-10.9-MDEV-27021-explain tree)
Expression_cache_tmptable object uses an Expression_cache_tracker object
to report the statistics.
In the common scenario, Expression_cache_tmptable destructor sets
tracker->cache=NULL. The tracker object survives after the expression
cache is deleted and one may call cache_tracker->fetch_current_stats()
for it with no harm.
However a degenerate cache with no parameters does not set
tracker->cache=NULL in Expression_cache_tmptable destructor which
results in an attempt to use freed data in the
cache_tracker->fetch_current_stats() call.
Fixed by setting tracker->cache to NULL and wrapping the assignment into
a function.
Diffstat (limited to 'sql/sql_select.cc')
0 files changed, 0 insertions, 0 deletions