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66d9658f5f557e0e525e5db5449ef94686df50d3
dhcp-option=66, sets the servername to nothing, and causes a segfault at DHCP transaction time. There may be other ways to provoke this, for instance by using an empty filename. The patch make safe_strncpy() even safer, by handing a NULL src argument. Thanks to Jeff Allen for spotting and reporting this.
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