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As reported by Bill Parker, PL/Tcl did not validate some malloc() calls against NULL return. Fix by using palloc() in a new long-lived memory context instead. This allows us to simplify error handling too, by simply deleting the memory context instead of doing retail frees. There's still a lot that could be done to improve PL/Tcl's memory handling ... This is pretty ancient, so backpatch all the way back. Author: Michael Paquier and Álvaro Herrera Discussion: https://www.postgresql.org/message-id/CAFrbyQwyLDYXfBOhPfoBGqnvuZO_Y90YgqFM11T2jvnxjLFmqw@mail.gmail.com