Erase password data on QLineEdit destruction

The contents of a deleted QString can still remain in memory
and can be accessible by tools that read the raw process memory.
This means that a QLineEdit that serves as a password input field
can leak the password after it is destroyed.

With this patch, the contents of the m_text string member variable
will be zeroed-out before the m_text is destructed. This is done
only in the cases when the QLineEdit serves as a password field.

[ChangeLog][QtWidgets][QWidgetLineControl/security] Zero-out the string
that contains a password entered into the QLineEdit

Change-Id: I8f88f952244bf8a0399c14acf0869439ca0a60ca
Reviewed-by: Luca Beldi <v.ronin@yahoo.it>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

0 files changed, 0 insertions, 0 deletions