Description:
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After I upgraded to pecl-lzf 1.6.3 I started seeing a small number of segfaults and "zend_mm_heap corrupted" errors, rolling back to 1.6.2 fixed the problem.

The problem seems to be limited to specific compressed strings (like the one in the example), but I'm not sure what is special about the string to cause the error.

The test script that I have provided actually works fine if the call to lzf_decompress is on the first line, but if there are any other lines before lzf_decompress() then the script fails with a "zend_mm_heap corrupted" error.

Test script:
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<?php

$data = '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';

$data = lzf_decompress(base64_decode($data));

var_dump($data);

Expected result:
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a var dump of a serialized php array:

string(2048) "a:6:{s:8:"batch_id";a:14:{s:11:"SCHEMA_NAME";N;s:10:"TABLE_NAME";s:14:"dataflow_batch";s:11:"COLUMN_NAME";s:8:"batch_id";s:15:"COLUMN_POSITION";i:1;s:9:"DATA_TYPE";s:3:"int";s:7:"DEFAULT";N;s:8:"NULLABLE";b:0;s:6:"LENGTH";N;s:5:"SCALE";N;s:9:"PRECISION";N;s:8:"UNSIGNED";b:1;s:7:"PRIMARY";b:1;s:16:"PRIMARY_POSITION";i:1;s:8:"IDENTITY";b:1;}s:10:"profile_id";a:14:{s:11:"SCHEMA_NAME";N;s:10:"TABLE_NAME";s:14:"dataflow_batch";s:11:"COLUMN_NAME";s:10:"profile_id";s:15:"COLUMN_POSITION";i:2;s:9:"DATA_TYPE";s:3:"int";s:7:"DEFAULT";s:1:"0";s:8:"NULLABLE";b:0;s:6:"LENGTH";N;s:5:"SCALE";N;s:9:"PRECISION";N;s:8:"UNSIGNED";b:1;s:7:"PRIMARY";b:0;s:16:"PRIMARY_POSITION";N;s:8:"IDENTITY";b:0;}s:8:"store_id";a:14:{s:11:"SCHEMA_NAME";N;s:10:"TABLE_NAME";s:14:"dataflow_batch";s:11:"COLUMN_NAME";s:8:"store_id";s:15:"COLUMN_POSITION";i:3;s:9:"DATA_TYPE";s:8:"smallint";s:7:"DEFAULT";s:1:"0";s:8:"NULLABLE";b:0;s:6:"LENGTH";N;s:5:"SCALE";N;s:9:"PRECISION";N;s:8:"UNSIGNED";b:1;s:7:"PRIMARY";b:0;s:16:"PRIMARY_POSITION";N;s:8:"IDENTITY";b:0;}s:7:"adapter";a:14:{s:11:"SCHEMA_NAME";N;s:10:"TABLE_NAME";s:14:"dataflow_batch";s:11:"COLUMN_NAME";s:7:"adapter";s:15:"COLUMN_POSITION";i:4;s:9:"DATA_TYPE";s:7:"varchar";s:7:"DEFAULT";N;s:8:"NULLABLE";b:1;s:6:"LENGTH";s:3:"128";s:5:"SCALE";N;s:9:"PRECISION";N;s:8:"UNSIGNED";N;s:7:"PRIMARY";b:0;s:16:"PRIMARY_POSITION";N;s:8:"IDENTITY";b:0;}s:6:"params";a:14:{s:11:"SCHEMA_NAME";N;s:10:"TABLE_NAME";s:14:"dataflow_batch";s:11:"COLUMN_NAME";s:6:"params";s:15:"COLUMN_POSITION";i:5;s:9:"DATA_TYPE";s:4:"text";s:7:"DEFAULT";N;s:8:"NULLABLE";b:1;s:6:"LENGTH";N;s:5:"SCALE";N;s:9:"PRECISION";N;s:8:"UNSIGNED";N;s:7:"PRIMARY";b:0;s:16:"PRIMARY_POSITION";N;s:8:"IDENTITY";b:0;}s:10:"created_at";a:14:{s:11:"SCHEMA_NAME";N;s:10:"TABLE_NAME";s:14:"dataflow_batch";s:11:"COLUMN_NAME";s:10:"created_at";s:15:"COLUMN_POSITION";i:6;s:9:"DATA_TYPE";s:9:"timestamp";s:7:"DEFAULT";N;s:8:"NULLABLE";b:1;s:6:"LENGTH";N;s:5:"SCALE";N;s:9:"PRECISION";N;s:8:"UNSIGNED";N;s:7:"PRIMARY";b:0;s:16:"PRIMARY_POSITION";N;s:8:"IDENTITY";b:0;}}"

Actual result:
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script crashes with "zend_mm_heap corrupted" error