linux-kernel - Re: [Patch] selinux: remove a useless return

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Date:	Tue, 08 Dec 2009 17:54:59 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Dan Carpenter <error27.lkml@...il.com>
CC:	linux-kernel@...r.kernel.org, Eric Paris <eparis@...isplace.org>,
	linux-security-module@...r.kernel.org, akpm@...ux-foundation.org,
	James Morris <jmorris@...ei.org>
Subject: Re: [Patch] selinux: remove a useless return

Dan Carpenter wrote:
> On 12/3/09, Amerigo Wang <amwang@...hat.com> wrote:
>> The last return is unreachable, remove the 'return'
>> in default, let it fall through.
>>
>> Signed-off-by: WANG Cong <amwang@...hat.com>
>> Cc: James Morris <jmorris@...ei.org>
>> Cc: Eric Paris <eparis@...isplace.org>
>>
>> ---
>>
>> diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
>> index b5407f1..718823d 100644
>> --- a/security/selinux/ss/mls.c
>> +++ b/security/selinux/ss/mls.c
>> @@ -542,7 +542,7 @@ int mls_compute_sid(struct context *scontext,
>>  		/* Use the process effective MLS attributes. */
>>  		return mls_context_cpy_low(newcontext, scontext);
>>  	default:
>> -		return -EINVAL;
>> +		/* Fallthrough */
>>  	}
>>  	return -EINVAL;
>>  }
> 
> I don't think this compiles.  GCC doesn't let you end a switch block
> with a label.
> 
> I also have sent the selinux people a patch that didn't compile by
> mistake.  Afterward I wrote this script so hopefully I won't mess up
> again.


Oops, sorry for this, my bad.
Thanks for your patch.

> 
> #!/bin/bash -e
> 
> files=$(grep +++ /home/dcarpenter/var/mail/postponed-msgs | cut -f 1 |
> cut -b 5-)
> for file in $files ; do
> 	file=${file/devel\//}
> 	file=${file/new\//}
> 	kchecker $file
> 	if which sparse | grep -q sparse ; then
> 		kchecker --sparse $file
> 	fi
> done
> 
> 
> You will have to change the path names.  Hm....  Also you will have to
> get the kchecker script from the smatch_data/ directory of smatch
> (http://repo.or.cz/w/smatch.git).

Thanks for the info! I will have a try.

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