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Memory leak in info man page fall back

From: Vitezslav Crhonek
Subject: Memory leak in info man page fall back
Date: Thu, 26 Jul 2018 14:24:58 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0


This time a memory leak is within the 'get_initial_file' function

Storage is returned from allocation function 'get_manpage_node' into
'man_node' pointer variable (line 290). If man_node is not NULL,
'return' is called without freeing the memory (line 298).

Steps to reproduce:
1) run '$ valgrind --leak-check=full fetchmail'
        (or any other argument, which doesn't have info page and fall
        backs to man page)
2) quit info and see valgrind summary

Attached patch resolves the issue.

Best regards,

Vitezslav Crhonek
Software Engineer
Red Hat

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