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Don't read past the end of the buffer containing permissions
characters or write past the end of the destination string.
Detected by CoverityScan CID#1415361, 1415376 ("Out-of-bounds access")
Fixes: e53cfe6c7c ("apparmor: rework perm mapping to a slightly broader set")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>