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Commite31d77c

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Initialize padding bytes in btree_gist varbit support.
The code expands a varbit gist leaf key to a node key by copying the bitdata twice in a varlen datum, as both the lower and upper key. The lower keywas expanded to INTALIGN size, but the padding bytes were not initialized.That's a problem because when the lower/upper keys are compared, the paddingbytes are used compared too, when the values are otherwise equal. That couldlead to incorrect query results.REINDEX is advised for any btree_gist indexes on bit or bit varying datatype, to fix any garbage padding bytes on disk.Per Valgrind, reported by Andres Freund. Backpatch to all supportedversions.
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‎contrib/btree_gist/btree_bit.c‎

Lines changed: 8 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -70,10 +70,14 @@ static bytea *
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gbt_bit_xfrm(bytea*leaf)
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{
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bytea*out=leaf;
73-
ints=INTALIGN(VARBITBYTES(leaf)+VARHDRSZ);
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out=palloc(s);
76-
SET_VARSIZE(out,s);
73+
intsz=VARBITBYTES(leaf)+VARHDRSZ;
74+
intpadded_sz=INTALIGN(sz);
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76+
out= (bytea*)palloc(padded_sz);
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/* initialize the padding bytes to zero */
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while (sz<padded_sz)
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((char*)out)[sz++]=0;
80+
SET_VARSIZE(out,padded_sz);
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memcpy((void*)VARDATA(out), (void*)VARBITS(leaf),VARBITBYTES(leaf));
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returnout;
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}

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