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Description of problem:
Between curl 7.19 (RHEL 6) and curl 7.29 (RHEL 7), a patch has been added to prevent a user to POST a directory. This also prevents to POST a char device.

curl: (43) A libcurl function was given a bad argument

Version-Release number of selected component (if applicable):
curl-7.29.0-54.el7.x86_64

How reproducible:
curl --form content="@/dev/null" http://form.example.org

Actual results:
curl: (43) A libcurl function was given a bad argument

Expected results:
Should work like on RHEL6, or on RHEL8 (but this part of code has been refactored in this release [7.61]).

Additional info:
An upstream patch which has been merged on the 7.29 version should fixes the issue.

https://github.com/curl/curl/commit/26eaa8383001219e7cd14a153dff95ea9274be6e

Thanks for the link!  This should be safe to backport for RHEL-7.

Just to confirm I just tried a backport and it works for me.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1020