[Rpm-maint] [rpm-software-management/rpm] Harden against crafted inputs (#1471)

[Demi Marie Obenour]

> All I've been asking is for you to make available the reproducers that you do have.

Ah okay.  I thought you were asking me to make reproducers for all of them, which would take time I don’t really have right now.  Here is an RPM (gzipped so GitHub will accept it) that reproduces the integer overflow.  You will need a build of RPM compiled with UBSan (Undefined Behavior Sanitizer) to detect the bug.

[rpm-4.15.1-3.fc32.1.src.rpm.gz](https://github.com/rpm-software-management/rpm/files/5820264/rpm-4.15.1-3.fc32.1.src.rpm.gz)



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