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| author | Andres Freund <andres@anarazel.de> | 2017-09-18 17:43:37 -0700 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2017-09-18 17:43:37 -0700 |
| commit | 0fb9e4ace5ce4d479d839a720f32b99fdc87f455 (patch) | |
| tree | 5d3ba82f4b6cb1f0619dd0771a62b4b18ba0ab5c /src/backend/lib/dshash.c | |
| parent | a1924a4ea29399111e5155532ca24c9c51d3c82d (diff) | |
| download | postgresql-0fb9e4ace5ce4d479d839a720f32b99fdc87f455.tar.gz postgresql-0fb9e4ace5ce4d479d839a720f32b99fdc87f455.zip | |
Fix uninitialized variable in dshash.c.
A bugfix for commit 8c0d7bafad36434cb08ac2c78e69ae72c194ca20. The code
would have crashed if hashtable->size_log2 ever had the same value as
hashtable->control->size_log2 by coincidence.
Per Valgrind.
Author: Thomas Munro
Reported-By: Tomas Vondra
Discussion: https://postgr.es/m/e72fb33c-4f31-f276-e972-263d9b59554d%402ndquadrant.com
Diffstat (limited to 'src/backend/lib/dshash.c')
| -rw-r--r-- | src/backend/lib/dshash.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/backend/lib/dshash.c b/src/backend/lib/dshash.c index 448e0587253..dd875730670 100644 --- a/src/backend/lib/dshash.c +++ b/src/backend/lib/dshash.c @@ -249,6 +249,7 @@ dshash_create(dsa_area *area, const dshash_parameters *params, void *arg) } hash_table->buckets = dsa_get_address(area, hash_table->control->buckets); + hash_table->size_log2 = hash_table->control->size_log2; return hash_table; } @@ -280,6 +281,14 @@ dshash_attach(dsa_area *area, const dshash_parameters *params, hash_table->find_exclusively_locked = false; Assert(hash_table->control->magic == DSHASH_MAGIC); + /* + * These will later be set to the correct values by + * ensure_valid_bucket_pointers(), at which time we'll be holding a + * partition lock for interlocking against concurrent resizing. + */ + hash_table->buckets = NULL; + hash_table->size_log2 = 0; + return hash_table; } |