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Fix masking of SP-GiST pages during xlog consistency check 

spg_mask() didn't take into account that pd_lower equal to SizeOfPageHeaderData
is still valid value.  This commit fixes that.  Backpatch to 11, where
spg_mask() pg_lower check was introduced.

Reported-by: Michael Paquier
Discussion: https://postgr.es/m/20200615131405.GM52676%40paquier.xyz
Backpatch-through: 11
This commit is contained in:
Alexander Korotkov 2020-06-20 17:34:51 +03:00
parent 15cb2bd270
commit a44dd932ff
1 changed files with 1 additions and 1 deletions
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2
src/backend/access/spgist/spgxlog.c
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@ -1008,6 +1008,6 @@ spg_mask(char *pagedata, BlockNumber blkno)
* Mask the unused space, but only if the page's pd_lower appears to have
* been set correctly.
*/
if (pagehdr->pd_lower > SizeOfPageHeaderData)
if (pagehdr->pd_lower >= SizeOfPageHeaderData)
mask_unused_space(page);
}