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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2023-05-16 10:53:42 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2023-05-16 10:53:42 -0400 |
| commit | eaf99e4c4ae4084b8261e5e1f9c2c93004a98638 (patch) | |
| tree | 4432e741afe2b22cc98fa1b9ada1e4572b432173 /contrib/fuzzystrmatch/sql/fuzzystrmatch.sql | |
| parent | f06156da18f67bc2c904c0a76b70dafcb14ca7c2 (diff) | |
| download | postgresql-REL_15_STABLE.tar.gz | |
Ensure Soundex difference() function handles empty input sanely.REL_15_STABLE
fuzzystrmatch's difference() function assumes that _soundex()
always initializes its output buffer fully. This was not so for
the case of a string containing no alphabetic characters, resulting
in unstable output and Valgrind complaints.
Fix by using memset() to fill the whole buffer in the early-exit
case. Also make some cosmetic improvements (I didn't care for the
random switches between "instr[0]" and "*instr" notation).
Report and diagnosis by Alexander Lakhin (bug #17935).
Back-patch to all supported branches.
Discussion: https://postgr.es/m/17935-b99316aa79c18513@postgresql.org
Diffstat (limited to 'contrib/fuzzystrmatch/sql/fuzzystrmatch.sql')
| -rw-r--r-- | contrib/fuzzystrmatch/sql/fuzzystrmatch.sql | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/contrib/fuzzystrmatch/sql/fuzzystrmatch.sql b/contrib/fuzzystrmatch/sql/fuzzystrmatch.sql index f05dc28ffb..1d0e2197fb 100644 --- a/contrib/fuzzystrmatch/sql/fuzzystrmatch.sql +++ b/contrib/fuzzystrmatch/sql/fuzzystrmatch.sql @@ -6,6 +6,7 @@ SELECT soundex('hello world!'); SELECT soundex('Anne'), soundex('Ann'), difference('Anne', 'Ann'); SELECT soundex('Anne'), soundex('Andrew'), difference('Anne', 'Andrew'); SELECT soundex('Anne'), soundex('Margaret'), difference('Anne', 'Margaret'); +SELECT soundex(''), difference('', ''); SELECT levenshtein('GUMBO', 'GAMBOL'); |