Hi all,
Coverity is pointing out that _int_split.c has unnecessary checks for
deferenced pointers in 5 places.
- if (inter_d != (ArrayType *) NULL)
- pfree(inter_d);
+ pfree(inter_d);
In this case inter_d is generated by inner_int_inter, a routine that
always generates an ArrayType with at least new_intArrayType.
In two places there is as well this pattern:
- if (datum_l)
- pfree(datum_l);
- if (union_dr)
- pfree(union_dr);
+ pfree(datum_l);
+ pfree(union_dr);
And that one:
- if (datum_r)
- pfree(datum_r);
- if (union_dl)
- pfree(union_dl);
+ pfree(datum_r);
+ pfree(union_dl);
union_dr and union_dl are generated by inner_int_union which never
returns NULL. Similarly, datum_r and datum_l are created with
copy_intArrayType the first time, which never returns NULL, and their
values are changed at each loop step. Also, as far as I understood
from this code, no elements manipulated are NULL, perhaps this is
worth an assertion?
Attached is a patch to adjust those things.
Regards,
--
Michael
diff --git a/contrib/intarray/_int_gist.c b/contrib/intarray/_int_gist.c
index 53abcc4..876a7b9 100644
--- a/contrib/intarray/_int_gist.c
+++ b/contrib/intarray/_int_gist.c
@@ -416,9 +416,7 @@ g_int_picksplit(PG_FUNCTION_ARGS)
size_waste = size_union - size_inter;
pfree(union_d);
-
- if (inter_d != (ArrayType *) NULL)
- pfree(inter_d);
+ pfree(inter_d);
/*
* are these a more promising split that what we've already seen?
@@ -517,10 +515,8 @@ g_int_picksplit(PG_FUNCTION_ARGS)
/* pick which page to add it to */
if (size_alpha - size_l < size_beta - size_r + WISH_F(v->spl_nleft, v->spl_nright, 0.01))
{
- if (datum_l)
- pfree(datum_l);
- if (union_dr)
- pfree(union_dr);
+ pfree(datum_l);
+ pfree(union_dr);
datum_l = union_dl;
size_l = size_alpha;
*left++ = i;
@@ -528,10 +524,8 @@ g_int_picksplit(PG_FUNCTION_ARGS)
}
else
{
- if (datum_r)
- pfree(datum_r);
- if (union_dl)
- pfree(union_dl);
+ pfree(datum_r);
+ pfree(union_dl);
datum_r = union_dr;
size_r = size_beta;
*right++ = i;
--
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