Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751168Ab3CITCU (ORCPT ); Sat, 9 Mar 2013 14:02:20 -0500 Received: from merlin.infradead.org ([205.233.59.134]:50297 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750798Ab3CITCT (ORCPT ); Sat, 9 Mar 2013 14:02:19 -0500 Message-ID: <1362855725.3690.92.camel@shinybook.infradead.org> Subject: Re: memory leak and other oddness in pinctrl-mvebu.c From: David Woodhouse To: Sebastian Hesselbarth Cc: Thomas Petazzoni , Stephen Warren , Jason Cooper , linux-kernel@vger.kernel.org Date: Sat, 09 Mar 2013 19:02:05 +0000 In-Reply-To: <513AF783.6050906@gmail.com> References: <1362758331.32099.121.camel@i7.infradead.org> <513AF783.6050906@gmail.com> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-PRZriZZP7hMIiTggjwse" X-Mailer: Evolution 3.6.3 (3.6.3-2.fc18) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11966 Lines: 223 --=-PRZriZZP7hMIiTggjwse Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2013-03-09 at 09:49 +0100, Sebastian Hesselbarth wrote: > I don't have a strong opinion on that, but I prefer not to have the list > statically in the SoC specific drivers. I think counting the number of > unique functions for each SoC specific driver once and verify the above > heuristic (fewer unique functions than pins) is still valid. Then drop > the krealloc and leave the array the way it is allocated on devm_kzalloc. Yeah. If you stick a check in the loop and make it warn if it *would* have run over the end of the array, that sounds like it ought to be fine. Something like this, perhaps? Still untested but otherwise Signed-off-by: David Woodhouse diff --git a/drivers/pinctrl/mvebu/pinctrl-mvebu.c b/drivers/pinctrl/mvebu/= pinctrl-mvebu.c index c689c04..55d55d5 100644 --- a/drivers/pinctrl/mvebu/pinctrl-mvebu.c +++ b/drivers/pinctrl/mvebu/pinctrl-mvebu.c @@ -478,7 +478,8 @@ static struct pinctrl_ops mvebu_pinctrl_ops =3D { .dt_free_map =3D mvebu_pinctrl_dt_free_map, }; =20 -static int _add_function(struct mvebu_pinctrl_function *funcs, const char = *name) +static int _add_function(struct mvebu_pinctrl_function *funcs, int nr_func= s, + const char *name) { while (funcs->num_groups) { /* function already there */ @@ -487,7 +488,11 @@ static int _add_function(struct mvebu_pinctrl_function= *funcs, const char *name) return -EEXIST; } funcs++; + nr_funcs--; } + if (!nr_funcs) + return -EOVERFLOW; + funcs->name =3D name; funcs->num_groups =3D 1; return 0; @@ -501,7 +506,7 @@ static int mvebu_pinctrl_build_functions(struct platfor= m_device *pdev, int n, s; =20 /* we allocate functions for number of pins and hope - * there are less unique functions than pins available */ + * there are fewer unique functions than pins available */ funcs =3D devm_kzalloc(&pdev->dev, pctl->desc.npins * sizeof(struct mvebu_pinctrl_function), GFP_KERNEL); if (!funcs) @@ -510,26 +515,27 @@ static int mvebu_pinctrl_build_functions(struct platf= orm_device *pdev, for (n =3D 0; n < pctl->num_groups; n++) { struct mvebu_pinctrl_group *grp =3D &pctl->groups[n]; for (s =3D 0; s < grp->num_settings; s++) { + int ret; + /* skip unsupported settings on this variant */ if (pctl->variant && !(pctl->variant & grp->settings[s].variant)) continue; =20 /* check for unique functions and count groups */ - if (_add_function(funcs, grp->settings[s].name)) + ret =3D _add_function(funcs, pctl->desc.npins, + grp->settings[s].name); + if (ret =3D=3D -EOVERFLOW) + dev_err(&pdev->dev, + "More functions than pins(%d)\n", + pctl->desc.npins); + if (ret) continue; =20 num++; } } =20 - /* with the number of 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