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Message-ID: <f4bdacff84b251728ba9fa2528ec011b6c7c6d15.camel@kylinos.cn>
Date: Mon, 17 Apr 2023 16:21:14 +0800
From: Hao Zeng <zenghao@...inos.cn>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: trenn@...e.com, shuah@...nel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cpupower:Fix resource leaks in sysfs_get_enabled()
Hi Shuah , Thanks very much for your review!
I tried to understand what you said as best I could and provided V3.
I look forward to your review again, it will help me a lot!
Best regards
-- Hao
On Fri, 2023-04-14 at 10:41 -0600, Shuah Khan wrote:
> On 4/13/23 21:08, Hao Zeng wrote:
> > When the read return value is equal to 1, a file handle leak will
> > occur
> >
>
> Would like a bit more information on how the error paths are
> redone, since memory leak isn't the only one that is fixed.
>
> > Signed-off-by: Hao Zeng <zenghao@...inos.cn>
> > Suggested-by: Shuah Khan <skhan@...uxfoundation.org>
> > ---
> > tools/power/cpupower/lib/powercap.c | 19 ++++++++++---------
> > 1 file changed, 10 insertions(+), 9 deletions(-)
> >
> > diff --git a/tools/power/cpupower/lib/powercap.c
> > b/tools/power/cpupower/lib/powercap.c
> > index 0ce29ee4c2e4..02ec5b0bff6b 100644
> > --- a/tools/power/cpupower/lib/powercap.c
> > +++ b/tools/power/cpupower/lib/powercap.c
> > @@ -40,7 +40,7 @@ static int sysfs_get_enabled(char *path, int
> > *mode)
> > {
> > int fd;
> > char yes_no;
> > -
> > + int ret = 0;
> > *mode = 0;
> >
> > fd = open(path, O_RDONLY);
> > @@ -48,17 +48,18 @@ static int sysfs_get_enabled(char *path, int
> > *mode)
> > return -1;
> >
> > if (read(fd, &yes_no, 1) != 1) {
> > - close(fd);
> > - return -1;
> > + ret = -1;
> > + goto err;
> > }
> >
> > - if (yes_no == '1') {
> > - *mode = 1;
> > - return 0;
> > - } else if (yes_no == '0') {
> > - return 0;
> > + if (yes_no != '1' || yes_no != '0') {
> > + ret = -1;
> > + goto err;
> > }
> > - return -1;
> > + *mode = yes_no - '0';
>
> I am not seeing much value in changing the above paths.
> Leave them unchanged.
>
> > +err:
> > + close(fd);
> > + return ret;
> > }
> >
> > int powercap_get_enabled(int *mode)
>
> thanks,
> -- Shuah
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