[Qt] prevent amount overflow problem with payment requests

Bitcoin amounts are stored as uint64 in the protobuf messages (see
paymentrequest.proto), but CAmount is defined as int64_t. Because
of that we need to verify that single and accumulated amounts are
in a valid range and no variable overflow has happened.

- fixes #5624 (#5622)

Thanks @SergioDemianLerner for reporting that issue and also supplying us
with a possible solution.

- add static verifyAmount() function to PaymentServer and move the logging
  on error into the function
- also add a unit test to paymentservertests.cpp

0 files changed, 0 insertions, 0 deletions