[lxc-devel] [lxc/lxc] 91bc7f: confile: improve strprint()

[GitHub]

  Branch: refs/heads/stable-3.0
  Home:   https://github.com/lxc/lxc
  Commit: 91bc7fb0d3f3eae129cfe825ce667b39a4736906
      https://github.com/lxc/lxc/commit/91bc7fb0d3f3eae129cfe825ce667b39a4736906
  Author: Christian Brauner <christian.brauner at ubuntu.com>
  Date:   2018-05-30 (Wed, 30 May 2018)

  Changed paths:
    M src/lxc/confile_utils.h

  Log Message:
  -----------
  confile: improve strprint()

POSIX specifies [1]:
"If the value of n is zero on a call to snprintf(), nothing shall be written,
the number of bytes that would have been written had n been sufficiently large
excluding the terminating null shall be returned, and s may be a null pointer."

But in case there are any non-sane libcs out there that do actually dereference
the buffer when when 0 is passed as length to snprintf() let's give them a
dummy buffer.

[1]: The Open Group Base Specifications Issue 7, 2018 edition
     IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
     Copyright © 2001-2018 IEEE and The Open Group

Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
Reported-by: Donghwa Jeong <dh48.jeong at samsung.com>



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