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* BUG #17935: Incorrect memory access in fuzzystrmatch/difference()
@ 2023-05-16 13:00 PG Bug reporting form <noreply@postgresql.org>
2023-05-16 14:23 ` Re: BUG #17935: Incorrect memory access in fuzzystrmatch/difference() Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: PG Bug reporting form @ 2023-05-16 13:00 UTC (permalink / raw)
To: pgsql-bugs@lists.postgresql.org; +Cc: exclusion@gmail.com
The following bug has been logged on the website:
Bug reference: 17935
Logged by: Alexander Lakhin
Email address: exclusion@gmail.com
PostgreSQL version: 15.3
Operating system: Ubuntu 22.04
Description:
When the following query executed:
CREATE EXTENSION fuzzystrmatch;
SELECT difference('', '');
Valgrind detects the following issue:
==00:00:00:04.351 1561837== Conditional jump or move depends on
uninitialised value(s)
==00:00:00:04.351 1561837== at 0x4867265: difference
(fuzzystrmatch.c:787)
==00:00:00:04.351 1561837== by 0x3FFC24: ExecInterpExpr
(execExprInterp.c:751)
==00:00:00:04.351 1561837== by 0x3FC3D8: ExecInterpExprStillValid
(execExprInterp.c:1826)
==00:00:00:04.351 1561837== by 0x4EDE9C: ExecEvalExprSwitchContext
(executor.h:341)
==00:00:00:04.351 1561837== by 0x4EDE9C: evaluate_expr (clauses.c:4823)
==00:00:00:04.351 1561837== by 0x4EE078: evaluate_function
(clauses.c:4325)
==00:00:00:04.351 1561837== by 0x4F0530: simplify_function
(clauses.c:3908)
==00:00:00:04.351 1561837== by 0x4EE33C: eval_const_expressions_mutator
(clauses.c:2427)
==00:00:00:04.351 1561837== by 0x47F0B5: expression_tree_mutator
(nodeFuncs.c:3080)
==00:00:00:04.351 1561837== by 0x4EF776: eval_const_expressions_mutator
(clauses.c:3527)
==00:00:00:04.351 1561837== by 0x47F2FF: expression_tree_mutator
(nodeFuncs.c:3166)
==00:00:00:04.351 1561837== by 0x4EF776: eval_const_expressions_mutator
(clauses.c:3527)
==00:00:00:04.351 1561837== by 0x4EF8F1: eval_const_expressions
(clauses.c:2107)
==00:00:00:04.351 1561837==
In this case, _soundex() exits prematurely and sets only first and last
char
of it's parameter outstr, but difference() loops through SOUNDEX_LEN
chars,
and thus uses initialized data.
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: BUG #17935: Incorrect memory access in fuzzystrmatch/difference()
2023-05-16 13:00 BUG #17935: Incorrect memory access in fuzzystrmatch/difference() PG Bug reporting form <noreply@postgresql.org>
@ 2023-05-16 14:23 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2023-05-16 14:23 UTC (permalink / raw)
To: exclusion@gmail.com; +Cc: pgsql-bugs@lists.postgresql.org
PG Bug reporting form <noreply@postgresql.org> writes:
> In this case, _soundex() exits prematurely and sets only first and last
> char
> of it's parameter outstr, but difference() loops through SOUNDEX_LEN
> chars,
> and thus uses initialized data.
Yup, that's pretty sloppy, will fix.
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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2023-05-16 13:00 BUG #17935: Incorrect memory access in fuzzystrmatch/difference() PG Bug reporting form <noreply@postgresql.org>
2023-05-16 14:23 ` Tom Lane <tgl@sss.pgh.pa.us>
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