curl version 7.37.1

This issue was discovered when running with a 64bit compilation.

The assignment of a ssize_t pointer from the parameter list to a size_t
pointer in the function causes stack corruption when data is assigned to
the variables location during 64bit execution.

The diff file attached shows one method to correct the issue. A simpler
method would be to eliminate the variable "wrote" and use "*wrotep +=
(ssize_t)piece;" at ~line 237.

Glen Johnson

Phone: 321-696-3122

Email: glenajohnsonjr_at_msn.com

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