Validate passed in timezone from tz option

Erik Sjolund reported an issue where a badly formated file
could be passed into the `--tz` option and then the date in the container
would be badly messed up:

```
erik@laptop:~$ echo Hello > file.txt
erik@laptop:~$ podman run --tz=../../../home/erik/file.txt --rm -ti
docker.io/library/alpine cat /etc/localtime
Hello
erik@laptop:~$ podman --version
podman version 3.0.0-rc1
erik@laptop:~$
```
This fix checks to make sure the TZ passed in is a valid
value and then proceeds with the rest of the processing.

This was first reported as a potential security issue, but it
was thought not to be.   However, I thought closing the hole
sooner rather than later would be good.

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

0 files changed, 0 insertions, 0 deletions