Fix bogus initialization of replication origin shared memory state.
The previous coding zeroed out offsetof(ReplicationStateCtl, states)
more bytes than it was entitled to, as a consequence of starting the
zeroing from the wrong pointer (or, if you prefer, using the wrong
calculation of how much to zero).
It's unsurprising that this has not caused any reported problems,
since it can be expected that the newly-allocated block is at the end
of what we've used in shared memory, and we always make the shmem
block substantially bigger than minimally necessary. Nonetheless,
this is wrong and it could bite us someday; plus it's a dangerous
model for somebody to copy.
This dates back to the introduction of this code (commit 5aa235042),
so back-patch to all supported branches.
Branch
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REL_12_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/c8b1c953b8be8ede059b104198c5603a251eb19f
Modified Files
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src/backend/replication/logical/origin.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)