Details
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Type:
Bug
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Status: Closed
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: 5.5.22, 5.5.23
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Fix Version/s: 5.5.24
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Component/s: None
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Labels:None
Description
The code in question is
if (!memcmp(from, tmp_file_prefix, tmp_file_prefix_length))
The problem here is that 'from' can have length < 4 (=tmp_file_prefix_length), and there might be anything past the end of from, for example another page with unmapped memory
The problem is found with Windows Application verifier, that tweaks heap allocations in a way that they are places at the end of the page. Quite a lot of innodb tests crash in this function, when mysqld is run under application verifier.
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