gbak may crash database when mixing alias with full database name
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Key: CORE-5893
URL: http://tracker.firebirdsql.org/browse/CORE-5893
Project: Firebird Core
Issue Type: Bug
Components: GBAK
Affects Versions: 3.0.3, 2.5.8, 4.0 Alpha 1
Reporter: Alexander Peshkov
One can crash a database by simple operation. An alias brp is created for
/db/brp.fdb:
brp = /db/brp.fdb
If by mistake gbak is started with:
gbak brp /db/brp.fdb .....
it directly overwrites parts of the database file instead of giving an error.
After it starts, it takes just a few seconds to make db file not usable.
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