Check ks buffer pointer overflow before dereferencing it. #77

Job	Run time
Build RPM / Build	1m 55s
Build DEB (bookworm, amd64) / Build	39s
Build DEB (bookworm, armhf) / Build	3m 23s
Build DEB (bullseye, amd64) / Build	40s
Build DEB (bullseye, armhf) / Build	3m 24s
Build DEB (buster, armhf) / Build	3m 23s
Build DEB (buster, amd64) / Build	45s
Build DEB (stretch, amd64) / Build	36s
Build DEB (stretch, armhf) / Build	2m 55s
Meta RPM	0s
Copy to remote RPM	0s
Copy meta to remote RPM	0s
Copy hash to remote RPM	0s
Copy to remote DEB	0s
Meta DEB	0s
Copy meta to remote DEB	0s
Copy hash to remote DEB	0s
	17m 40s

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