Check for relation length overrun soon enough. We don't allow relations to exceed 2^32-1 blocks, because block numbers are 32 bits and the last possible block number is reserved to mean InvalidBlockNumber. There is a check for this in mdextend, but that's really way too late, because the smgr API requires us to create a buffer for the block-to-be-added, and we do not want to have any buffer with blocknum InvalidBlockNumber. (Such a case can trigger assertions in bufmgr.c, plus I think it might confuse ReadBuffer's logic for data-past-EOF later on.) So put the check into ReadBuffer.
Per report from Christoph Berg. It's been like this forever, so back-patch to all supported branches. Discussion: https://postgr.es/m/[email protected] Branch ------ REL9_6_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/cc4de2bba02ffcd11caf980fb4c1a500f64bf137 Modified Files -------------- src/backend/storage/buffer/bufmgr.c | 9 +++++++++ src/backend/storage/smgr/md.c | 3 ++- 2 files changed, 11 insertions(+), 1 deletion(-)
