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eb60168382
A 'AddDhcpLease' DBus message which fails to allocate a DHCP lease will cause dnsmasq to dereference a NULL pointer and crash. Allocation failure can happen if the particular flavour (IPv4 pr IPv6) of DHCP is not configured in this dnsmasq instance, or if the configured limit on DHCP leases is reached or (unlikley) if dnsmasq cannot allocate memory. This patch provides error returns for all these situations. This patch is inspired by a patch from Stefan Hanreich <s.hanreich@proxmox.com> which was prompted by a bug report from Lou Lécrivain.