[lwip-devel] [patch #6760] Ping calculates incorrect checksum

[Simon Goldschmidt]

Follow-up Comment #5, patch #6760 (project lwip):

The change to calculate data_len was only to get cleaner code: *if* the len
argument is provided to the function and checksum is calculated with it, the
data should also use it. If we want to prevent the 'extra calculation', it
would be better to leave out the len argument altogether.

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