[Bug 2684] New: calling realloc with a size <= 0

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2684

            Bug ID: 2684
           Summary: calling realloc with a size <= 0
           Product: Portable OpenSSH
           Version: -current
          Hardware: amd64
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-bugs at mindrot.org
          Reporter: trix at juniper.net

Created attachment 2949
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2949&action=edit
The fix for master branch at commit id
d5499190559ebe374bcdfa8805408646ceffad64

Problem flagged by clang's static analyzer as :
Undefined allocation of 0 bytes (CERT MEM04-C; CWE-131) 

The fix is the check the inputs better.
See the attachment for the location/fix

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