linux-kernel - Re: [PATCH 0/10] fix error return code

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Message-ID: <alpine.DEB.2.02.1504051412030.2038@localhost6.localdomain6>
Date:	Sun, 5 Apr 2015 14:12:30 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Jaroslav Kysela <perex@...ex.cz>
cc:	kernel-janitors@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/10] fix error return code

Please ignore. Wrong patch set.

On Sun, 5 Apr 2015, Julia Lawall wrote:

> These patches fix cases where the return code appears to be unintentially
> nonnegative.
> 
> The complete semantic match that finds the problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @ok exists@
> identifier f,ret,i;
> expression e;
> constant c;
> @@
> 
> f(...) {
> <+...
> (
> return -c@i;
> |
> ret = -c@i;
> ... when != ret = e
> return ret;
> |
> if (ret < 0) { ... return ret; }
> )
> ...+> }
> 
> @r exists@
> identifier ret,l,ok.f;
> expression e1,e2,e3;
> statement S;
> position p1,p2,p3;
> @@
> 
> f(...) {
> ... when any
> (
> if@p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret@p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> (
>  if (<+... ret = e3 ...+>) S
> |
>  if (<+... &ret ...+>) S
> |
> if@p2(...)
>  {
>   ... when != ret = e2
>       when forall
>  return@p3 ret;
> }
> )
> ... when any
> }
> 
> @bad exists@
> position r.p1,r.p2;
> statement S1,S2;
> identifier r.ret;
> expression e1;
> @@
> 
> (
> if@p1 (\(ret < 0\|ret != 0\)) S1
> |
> ret@p1 = 0
> )
> ... when any
> ret = e1
> ... when any
> if@p2(...) S2
> 
> @bad2@
> position r.p1,r.p2;
> identifier r.ret;
> expression e1;
> statement S2;
> @@
> 
> ret@p1 = 0
> ... when != if (...) { ... ret = e1 ... return ret; }
>     when any
> if@p2(...) S2
> 
> 
> @script:python depends on !bad && !bad2@
> p1 << r.p1;
> p2 << r.p2;
> p3 << r.p3;
> @@
> 
> cocci.print_main("",p1)
> cocci.print_secs("",p2)
> cocci.print_secs("",p3)
> // </smpl>
> 
> --
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