simplehash: Free collisions array in SH_STAT

While SH_STAT() is only used for debugging, the allocated array can be large,
and therefore should be freed.

It's unclear why coverity started warning now.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Reported-by: Coverity
Discussion: https://postgr.es/m/3005248.1712538233@sss.pgh.pa.us
Backpatch: 12-

diff --git a/src/include/lib/simplehash.h b/src/include/lib/simplehash.h
index b7adc16b807d4ce66a28c515fd85655cb14f6051..1dc817ac8d9d15ba387f1b9eacacb12c943109f4 100644 (file)
--- a/src/include/lib/simplehash.h
+++ b/src/include/lib/simplehash.h
@@ -1101,6 +1101,9 @@ SH_STAT(SH_TYPE * tb)
            max_collisions = curcoll;
    }
 
+   /* large enough to be worth freeing, even if just used for debugging */
+   pfree(collisions);
+
    if (tb->members > 0)
    {
        fillfactor = tb->members / ((double) tb->size);