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Avoid invalid alloc size error in shm_mq
authorPeter Eisentraut <peter@eisentraut.org>
Mon, 19 Oct 2020 06:52:25 +0000 (08:52 +0200)
committerPeter Eisentraut <peter@eisentraut.org>
Tue, 20 Oct 2020 12:31:52 +0000 (14:31 +0200)
commitbd0677bb8a54683b05b75fc242bd5c757ce5edd8
tree8872deaea1f77a110123001cad7d8822ce193744tree | snapshot
parentc6d0b9b1668cde5f13e632bad813bd9d666caf9bcommit | diff
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 buffer
size is increased.

Add error checks (documenting the upper limit) and avoid the error by
limiting 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.com
src/backend/storage/ipc/shm_mq.c diff | blob | blame | history
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