[TYPO3-core] Gremlin #76: t3lib_div::writeFile() changes permissions without need

[Michael Stucki]

Author reports:

Playing around with the filelist module, I discovered the following bug:
If a file has been edited via filelist, the permissions are changed to 775
after saving (or whatever given in ['TYPO3_CONF_VARS']['BE'
['fileCreateMask']).
The editor uses t3lib_div::writeFile(), but this function does not check if
a file did exist before writing and so does not preserve its permissions.


Solution:

Check if the file exists, set a flag, and only change the permissions if
this flag was set.

- michael
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