Published at LXer:

Coverity's latest Coverity Scan Open Source Report has found that the quality of open source code is equal to, or even better than that of proprietary software. This is the third open source report from Coverity since it took over producing the report in 2009. The project was originally founded by the US Department of Homeland Security in conjunction with Coverity in 2006. Coverity's conclusion is that the assumption that open source software is of lower quality should not be considered a valid reason for avoiding open source.

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FLOSS generally produces better quality code, as this project report details. This is because more devs have access to the code and can spot errors better than the fewer devs that work on proprietary code. The other reason is because few submit details of exploits of proprietary code, instead black hats use the exploit. There's no real reason to contribute code to a proprietary project anyway.