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Avoid invalid alloc size error in shm_mq
In shm_mq_receive(), a huge payload could trigger an unjustified"invalid memory alloc request size" error due to the way the buffersize is increased.Add error checks (documenting the upper limit) and avoid the error bylimiting the allocation size to MaxAllocSize.Author: Markus Wanner <markus.wanner@2ndquadrant.com>Discussion:https://www.postgresql.org/message-id/flat/3bb363e7-ac04-0ac4-9fe8-db1148755bfa%402ndquadrant.com1 parentc6d0b9b commitbd0677b
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