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Fix calculation of how much shared memory is required to store a TOC. 

Commit ac883ac453 refactored shm_toc_estimate() but changed its calculation
of shared memory size for TOC incorrectly. Previously this could cause too
large memory to be allocated.

Back-patch to v11 where the bug was introduced.

Author: Takayuki Tsunakawa
Discussion: https://postgr.es/m/TYAPR01MB2990BFB73170E2C4921E2C4DFEA80@TYAPR01MB2990.jpnprd01.prod.outlook.com
This commit is contained in:
Fujii Masao 2021-01-15 12:44:17 +09:00
parent 79d3ac72f6
commit 60369db86f
1 changed files with 2 additions and 2 deletions
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4
src/backend/storage/ipc/shm_toc.c
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@ -265,8 +265,8 @@ shm_toc_estimate(shm_toc_estimator *e)
Size sz;
sz = offsetof(shm_toc, toc_entry);
sz += add_size(sz, mul_size(e->number_of_keys, sizeof(shm_toc_entry)));
sz += add_size(sz, e->space_for_chunks);
sz = add_size(sz, mul_size(e->number_of_keys, sizeof(shm_toc_entry)));
sz = add_size(sz, e->space_for_chunks);
return BUFFERALIGN(sz);
}