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Fix integer-overflow problem in intarray's g_int_decompress().

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An array element equal to INT_MAX gave this code indigestion,
causing an infinite loop that surely ended in SIGSEGV.  We fixed
some nearby problems awhile ago (cf 757c5182f) but missed this.

Report and diagnosis by Alexander Lakhin (bug #18273); patch by me

Discussion: https://postgr.es/m/18273-9a832d1da122600c@postgresql.org
This commit is contained in:
Tom Lane
2024-01-07 15:19:50 -05:00
parent 72d5b27763
commit 1c7443521f
3 changed files with 15 additions and 12 deletions
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10
contrib/intarray/_int_gist.c
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@@ -287,8 +287,7 @@ g_int_decompress(PG_FUNCTION_ARGS)
ArrayType *in;
int lenin;
int *din;
int i,
j;
int i;
in = DatumGetArrayTypeP(entry->key);
@@ -332,9 +331,12 @@ g_int_decompress(PG_FUNCTION_ARGS)
dr = ARRPTR(r);
for (i = 0; i < lenin; i += 2)
for (j = din[i]; j <= din[i + 1]; j++)
{
/* use int64 for j in case din[i + 1] is INT_MAX */
for (int64 j = din[i]; j <= din[i + 1]; j++)
if ((!i) || *(dr - 1) != j)
*dr++ = j;
*dr++ = (int) j;
}
if (in != (ArrayType *) DatumGetPointer(entry->key))
pfree(in);