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DevPathToTextUsbWWID allocates a separate copy of the SerialNumber string to append a null terminator if the original string is not null terminated. However, by using AllocateCopyPool, it tries to copy 'Length + 1' words from the existing string containing 'Length' characters into the target string. Split the copy out to only copy 'Length' characters instead.
This was reported by GCC's -Wstringop-overread when compiling a copy of this routine included in a library on FreeBSD.
Signed-off-by: John Baldwin jhb@FreeBSD.org