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Fix out-of-bound read in gtsvector_picksplit() 

This could lead to an imprecise choice when splitting an index page of a
GiST index on a tsvector, deciding which entries should remain on the
old page and which entries should move to a new page.

This is wrong since tsearch2 has been moved into core with commit
140d4ebcb4, so backpatch all the way down.  This error has been
spotted by valgrind.

Author: Alexander Lakhin
Discussion: https://postgr.es/m/17950-6c80a8d2b94ec695@postgresql.org
Backpatch-through: 11
This commit is contained in:
Michael Paquier 2023-09-04 14:55:57 +09:00
parent a67cf94115
commit 40ddb8db9f
1 changed files with 2 additions and 2 deletions
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4
src/backend/utils/adt/tsgistidx.c
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@ -728,7 +728,7 @@ gtsvector_picksplit(PG_FUNCTION_ARGS)
size_alpha = 0;
else
size_alpha = SIGLENBIT - sizebitvec(
(cache[j].allistrue) ? GETSIGN(datum_l) : GETSIGN(cache[j].sign)
(cache[j].allistrue) ? GETSIGN(datum_l) : cache[j].sign
);
}
else
@ -740,7 +740,7 @@ gtsvector_picksplit(PG_FUNCTION_ARGS)
size_beta = 0;
else
size_beta = SIGLENBIT - sizebitvec(
(cache[j].allistrue) ? GETSIGN(datum_r) : GETSIGN(cache[j].sign)
(cache[j].allistrue) ? GETSIGN(datum_r) : cache[j].sign
);
}
else