linux-kernel - Re: [PATCH v2] fixdep: exit with error code in error branches of do_config

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Date:   Mon, 8 Jan 2018 11:17:10 +0100 (CET)
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Nicholas Mc Guire <der.herr@...r.at>,
        sil2review@...ts.osadl.org, Michal Marek <michal.lkml@...kovi.net>,
        Sam Ravnborg <sam@...nborg.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] fixdep: exit with error code in error branches of
 do_config_file()


On Sun, 31 Dec 2017, Masahiro Yamada wrote:

> 2017-12-22 4:10 GMT+09:00 Lukas Bulwahn <lukas.bulwahn@...il.com>:
>> diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
>> index bbf62cb..4274610 100644
>> --- a/scripts/basic/fixdep.c
>> +++ b/scripts/basic/fixdep.c
>> @@ -284,19 +284,18 @@ static void do_config_file(const char *filename)
>>                 exit(2);
>>         }
>>         if (st.st_size == 0) {
>> -               close(fd);
>> -               return;
>> +               fprintf(stderr, "fixdep: error empty file config file: ");
>> +               perror(filename);
>> +               exit(2);
>>         }
>
> No.  This is correct as-is.
>
> do_config_file() does not parse .cmd files
> but parse source files (.c .h .S etc.)
>
> Having an empty source file is rare, but possible.
>
>

Now that I looked at the code for creating the v3 patch, I am confused 
about the error messages in scripts/basic/fixdep.c, lines 275 - 285, in 
do_config_file():

         fd = open(filename, O_RDONLY);
         if (fd < 0) {
                 fprintf(stderr, "fixdep: error opening config file: ");
                 perror(filename);
                 exit(2);
         }
         if (fstat(fd, &st) < 0) {
                 fprintf(stderr, "fixdep: error fstat'ing config file: ");
                 perror(filename);
                 exit(2);
         }

These error messages suggest that filename (and the file handler fd) 
refers to a config file, but you say that filename and fd refer to source 
files.

Looking at parse_dep_file() and how it invokes do_config_file(), I think 
you are right that it does refer to source files.

If you confirm that this is correct, I would change `config file` to 
`source file` in the error messages of do_config_file().

What is best to do here, provide a separate patch or add it to the 
existing patch?

Lukas