Re: BUG #16190: The usage of NULL pointer in refint.c

--1rguoi8KZGYj2k4L
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Mon, Jan 06, 2020 at 03:39:36AM +0000, PG Bug reporting form wrote:
> We checked the code in file =E2=80=9Crefint.c=E2=80=9D and there is one e=
rror occurring in
> line 636. This error is caused by the usage of pointer with NULL value. T=
he
> code in this line is =E2=80=9Cnewp->ident =3D strdup(ident);=E2=80=9D The=
 pointer =E2=80=9Cnewp=E2=80=9D is
> defined by the code in line 615 as =E2=80=9CEPlan *newp;=E2=80=9D and ini=
tialized by the
> code in line 628 as =E2=80=9Cnewp =3D *eplan + i;=E2=80=9D or in line 632=
 as =E2=80=9Cnewp =3D *eplan =3D
> (EPlan *) malloc(sizeof(EPlan));=E2=80=9D according to different conditio=
ns. In the
> first condition, the =E2=80=9C*eplan=E2=80=9D is valued by the code =E2=
=80=9C*eplan =3D (EPlan *)
> realloc(*eplan, (i + 1) * sizeof(EPlan));=E2=80=9D in line 627. We found =
the code
> hasn=E2=80=99t checked if the process =E2=80=9Crealloc=E2=80=9D and =E2=
=80=9Cmalloc=E2=80=9D are success or not
> which directly define the value of =E2=80=9C*eplan=E2=80=9D. The program =
should check the
> effectiveness of the return value of function =E2=80=9Crealloc=E2=80=9D a=
nd =E2=80=9Cmalloc=E2=80=9D to
> avoid this error.

It could be better to switch all that to not use directly system
calls, and rely properly on a high-level memory context with
palloc-like allocations.  There could be also an argument to just
remove the module per the lack of attention it is getting, though it
is still useful as an example of use for SPI, and the docs mention
it for that.
--
Michael

--1rguoi8KZGYj2k4L
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----
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=G/U2
-----END PGP SIGNATURE-----

--1rguoi8KZGYj2k4L--